아

oh; ah

Explanation

1. oh; ah
An exclamation uttered when the speaker expresses his/her surprise, embarrassment, impatience, or urgency.

2. oh; wow; ah
An exclamation uttered when the speaker expresses his/her delight or excitement.

3. oh; aww; oh no
An exclamation uttered when the speaker expresses the feelings of worry, anxiety, regret, or lamentation.

4. umm; ahem
An exclamation uttered before the speaker begins his/her words when he/she talks to someone or attracts someone's attention.

5. oh; aha; oh yeah
An exclamation uttered when the speaker realizes something he/she did not know.

Examples
아, 그래요.
<span class="focus">Ah</span>, I see.
아, 은지예요.
<span class="focus">Oh</span>, it's Eunji.
아, 미국 학생이에요.
<span class="focus">Oh</span>, an American student.

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