The Korean Vowel ㅗ (o): Sound, Strokes and Example Words

What you will be able to do after this lesson

• Pronounce ㅗ as a steady, rounded [o] with no "oh-w" glide.
• Write ㅗ in 2 strokes and place it under a consonant, as in 고 and 노.
• Separate 오리 "duck" from 우리 "we" and 고기 "meat" from 거기 "there" by ear.
• Read seven example words aloud, from 오이 to 보다.
• Recognise ㅗ as the first half of ㅘ, ㅙ and ㅚ.

Before you start: the lesson on the previous vowel lesson (ㅏ) helps but is not required. Time: about 20 minutes. Level: A0.

How Do You Pronounce the Korean Vowel ㅗ?

ㅗ is pronounced [o]: lips rounded, jaw half open, and one steady sound from start to finish. It is the "o" of Spanish "no" or Italian "sole". It is not the English "o" of "go", which slides toward "w" at the end. Listen to the vowel name 오.

Revised Romanization, South Korea's official Latin-letter system, writes ㅗ as "o". Treat that spelling as a learning aid only. The model is the recording, not an English reading of the letter.

Mouth and Tongue Position for ㅗ

Three body cues help you copy ㅗ:

1. Lips: round them into a small, relaxed "O". They move forward a little but are not tight.
2. Jaw: open it about halfway, less than for ㅏ.
3. Tongue: pull the body of the tongue back and raise it to a middle height.

Phoneticians call ㅗ a mid back rounded vowel. "Back" means the tongue bunches toward the throat, and "rounded" means the lips are pushed into a circle. Move from ㅏ to ㅗ and you will feel two changes at once: the jaw rises and the lips round.

How Is ㅗ Different from English Vowels?

ㅗ differs from English "o" because English "o" is usually a diphthong, a vowel that glides into a second sound. In "go", the mouth starts at [o] and ends near [w]. Korean ㅗ stays on one position, so a Korean "고" sounds shorter and cleaner than English "go".

A second difference is spelling. English writes the same sound many ways ("go", "boat", "sew", "though"), and writes the letter "o" with other sounds too ("on", "women", "love"). Hangul writes the sound [o] one way, with ㅗ, and ㅗ is always [o].

A quick self-test: say "oh" slowly and watch your lips in a mirror. If they close at the end into a small "w" shape, you are saying the English diphthong. Stop the sound while the lips are still open and round.

Why Is ㅗ Drawn This Way?

ㅗ is drawn as a horizontal line with a short stroke above it because Hangul's vowels were built from three shapes: a dot (heaven), a horizontal line (earth) and a vertical line (a standing person). ㅗ is the earth line with the heaven dot above it. The design is described in the Hunminjeongeum Haerye (1446), the guide that explained the new alphabet.

Place the dot below the line and you get ㅜ. Place it to the right of a vertical line and you get ㅏ. The dot's position tells you the vowel's family. Dots above or to the right mark bright vowels (양성 모음, yangseong moeum): ㅗ and ㅏ. Dots below or to the left mark dark vowels (음성 모음, eumseong moeum): ㅜ and ㅓ.

So ㅗ counts as a bright vowel in vowel harmony (모음조화, moeumjohwa). This matters later for verb endings, because a stem whose last vowel is ㅗ or ㅏ takes 아요, not 어요. For example, 보다 (to see) becomes 봐요 (sees, polite). Bright and dark vowels explains the rule in full.

How to Write ㅗ in 2 Strokes

Write ㅗ with two strokes, in this order:

1. Draw the short vertical stroke at the top middle, from top to bottom.
2. Draw the long horizontal line below it, from left to right.

The vertical stroke is short and sits in the middle of the horizontal line, never at an end. Keep the horizontal line flat and long enough that the block will look balanced when a consonant sits above it. Compare it with ㅜ, where the two strokes swap places. A handy cue is that ㅗ points up, like a small hill. For all vowels together, see Korean vowel stroke order.

Where Does ㅗ Sit in a Syllable Block?

ㅗ sits under its consonant, because it is a horizontal vowel. Korean letters are packed into square blocks, and a horizontal vowel pushes the consonant up and the vowel down.

In 고, ㄱ is the roof and ㅗ is the floor. The two letters share the same width. The layout is taught in detail in horizontal-vowel blocks.

Writing ㅗ Alone as 오

Written alone, ㅗ is spelled 오, with the silent consonant ㅇ above it. Every Korean syllable block needs a first consonant slot. When the syllable begins with a vowel sound, ㅇ fills that slot and makes no sound at the start of a block. So "oh" is written 오, never ㅗ alone, and 오 is also the name of the letter.

The 고 Row: ㅗ with the Consonants

The 고 row is the basic consonants joined to ㅗ: 고 노 도 로 모 보 소 오 조 초 코 토 포 호. Read it aloud once and notice that the vowel never changes. Only the consonant changes.

Pay attention to the Romanization of ㅗ. It always uses "o", so 고 is "go", not "goh". English readers often add an extra "h" in their heads. Keep the sound short.

Worked Example: Reading 오이, 고기 and 보다

To read a Korean word, split each block into letters, say each sound, then join them. Three words give a good first practice with ㅗ.

Word 1: 오이 (oi), "cucumber". The first block is ㅇ + ㅗ = 오, so the silent ㅇ leaves only [o]. The second block is ㅇ + ㅣ = 이, which is [i]. Together they sound like [오이], "oh-ee", with the second vowel arriving cleanly after the first.

Word 2: 고기 (gogi), "meat". The first block is ㄱ + ㅗ = 고, sounding [go]. The second block is ㄱ + ㅣ = 기, sounding [gi]. The word is [고기]. Revised Romanization writes ㄱ as "g" in both blocks, but the sounds differ slightly: at the start of a word ㄱ is a light, almost unvoiced [k], and between vowels it softens to a voiced [g].

Word 3: 보다 (boda), "to see; to look". The first block is ㅂ + ㅗ = 보, sounding [bo]. The second block is ㄷ + ㅏ = 다, sounding [da]. This is the dictionary form of a very common verb, and it matters for the preview below.

Here are four more words with ㅗ.

Preview: Why 보아요 Becomes 봐요

보다 (to see) has the polite present form 봐요. The pieces are the stem 보, the ending 아요, and a contraction: ㅗ + ㅏ merge into one vowel, ㅘ. So 보아요 (bo-a-yo) becomes 봐요 (bwa-yo). Both spellings are understood, and the short one is far more common in speech and writing. This is only a preview; the full rule is taught in the grammar section, and the vowel ㅘ has its own lesson.

What Other Vowels Are Built from ㅗ?

Four vowels use ㅗ as their base, which is why it is worth learning well.

Each one is written with the consonant on top and the ㅗ part underneath. You do not need to learn these now. The takeaway is that a steady ㅗ is the foundation of the whole "o" family.

How Can You Hear the Difference between ㅗ, ㅜ and ㅓ?

ㅗ is rounded and half open, ㅜ is rounded and nearly closed, and ㅓ is half open with relaxed lips. Two word pairs show the contrast: 오리 (ori, "duck") against 우리 (uri, "we; our"), and 고기 (gogi, "meat") against 거기 (geogi, "there").

Use these cues when you listen. For 오리 and 우리, watch the jaw: it rises for ㅜ. For 고기 and 거기, watch the lips: they round for ㅗ and relax for ㅓ. Many English speakers hear ㅗ and ㅓ as nearly the same sound at first, because English has no vowel pair separated only by lip rounding in this region. That is normal, and it improves with repeated listening.

Which Mistakes Do Learners Make with ㅗ?

Learners most often make three mistakes with ㅗ, and each has a simple fix.

1. Adding a w-glide. Learners often assume Korean "o" ends like English "go". Actually ㅗ is one steady sound, so "gow-gi" is wrong for 고기. Fix: stop the sound while the lips are still open and round.
2. Writing ㅗ to the right of a consonant. Learners often assume all vowels sit to the right. Actually horizontal vowels sit below the consonant, so 고 is a tall block, not a wide one. Fix: ask yourself whether the long stroke is horizontal; if yes, the vowel goes underneath.
3. Confusing ㅗ with ㅓ when listening. Learners often assume the two sound alike because both have the same jaw height. Actually ㅗ has rounded lips and ㅓ does not. Fix: say 고기 and 거기 in a mirror and watch your lips.

An expert tip: when unsure between ㅗ and ㅜ, look at the stroke. If the short stroke is above the line, it is ㅗ, and the sound is more open.

Practice: Read and Hear ㅗ

Try each task before you check the answers.

1. Pick by ear. Play 오리 and 우리. Which word has the more open vowel?
2. Write. Write the vowel ㅗ alone as a full syllable, then write the block for [no].
3. Read. Read these words aloud and give the meaning: 오이, 고기, 보다.
4. Sort. Is ㅗ a vertical or a horizontal vowel? On which side of the consonant does it sit?

Answers to the Practice

1. 오리 has ㅗ, the more open vowel. 우리 has ㅜ, with a nearly closed jaw.
2. 오 is the vowel alone; 노 is ㄴ + ㅗ, pronounced [no].
3. 오이 means cucumber, 고기 means meat, and 보다 means to see or to look.
4. ㅗ is a horizontal vowel, so it sits below the consonant.

If you missed an answer, replay the clip and say it along with the recording. For extra drills, use the Hangul flashcard decks, which play audio only when you tap, or test your ear with the Hangul quizzes. You can build blocks yourself in the hangul syllable builder or browse every letter in the interactive hangul alphabet. To write by hand, print the korean vowels writing practice sheet.

What Should You Learn after ㅗ?

Learn ㅜ next, because it is the nearest neighbour of ㅗ and the pair is easy to mix up. You now know the Korean vowel ㅗ: its steady [o] sound, its two strokes, its place under a consonant, and its silent-ㅇ form 오. The next lesson is the next Hangul lesson. If you want to see ㅗ combined with ㅏ, jump ahead to the vowel ㅘ.

This lesson does not cover ㅗ before final consonants, or how ㅗ changes in verb endings beyond the 봐요 preview. Those topics belong to the syllable-block and grammar sections. For the whole group, return to basic Korean vowels, compare mouth diagrams on Korean vowel sounds, or print the Korean vowels chart. You can also revisit the previous vowel lesson to contrast the open ㅏ with the rounded ㅗ.

Honest limits of this page: mouth-position descriptions are approximations for English speakers, and the recordings are the reference. The standard Seoul pronunciation is described; regional speech varies.

Frequently Asked Questions

Is ㅗ the same as the English o? Not quite. English "o" in "go" is a diphthong that slides toward "w" at the end. Korean ㅗ is a single steady rounded vowel, closer to the "o" of Spanish "no". Say the sound, hold the lips in a round shape, and stop before the lips close into a "w".

Why does the consonant go above ㅗ? ㅗ is a horizontal vowel. Its long stroke runs left to right, so Hangul stacks the consonant above it instead of placing it on the left. The rule is simple: vertical vowels (ㅏ ㅓ ㅣ) take the consonant on the left, and horizontal vowels (ㅗ ㅜ ㅡ) take it on top, as in 고.

How is ㅗ different from ㅜ? Both are rounded vowels written with a horizontal line, but ㅗ has the short stroke above the line and ㅜ has it below. In sound, ㅗ has a half-open jaw and ㅜ has a nearly closed jaw with tighter lips. The pair 오리 "duck" and 우리 "we" lets you hear the difference.

How many strokes does ㅗ have? ㅗ has two strokes. Draw the short vertical stroke first, from top to bottom at the middle of the space, then draw the long horizontal line beneath it from left to right. Keeping the two strokes in this order helps the letter stay centred under a consonant such as ㄱ in 고.

Why does 보아요 become 봐요? In the polite present tense, the stem 보 takes the ending 아요. The vowels ㅗ and ㅏ meet, and Korean contracts them into the single vowel ㅘ, giving 봐요. Both forms are acceptable, but the contracted one is more common. This pattern is taught fully in the grammar section.

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