一旦

yī dàn

HSK 2.0 Level 5 HSK 3.0 Level 5 Adverb Common

Save to list

A add to a list Esc back to results

Select an entry

This word has multiple dictionary entries. Choose the reading or usage you want to review.

一旦

yí dàn Conjunction once; as soon as

一旦

yī dàn Adverb in case (sth happens); if

Definitions

1. in case (sth happens)
2. if
3. once (sth happens, then...)
4. when
5. in a short time
6. in one day

Stop forgetting what you study.
Build recall daily.

Try HanyuGuide's Chinese review system with multiple choice, typed recall, tone-aware practice, and reviews scheduled before memory fades.

Get Yearly · $49.99 / year

Sign up with Google

Did Google show an error? Sorry about that. Use your email below instead.

Continue with Email

By continuing, you agree to our Terms of Use and Privacy Policy.

Lifetime for $119.99 Try a practice session

Word relationships

Related words

2 items

• 如果 rú guǒ 如果 rú guǒ if 都表示假设条件，但'一旦'强调条件发生后紧接着的结果，语气更强烈。: if
• 当 dāng 当 dāng (onom.) dong '一旦'可用于表示某个时间点，与'当...的时候'类似，但更强调突然发生的变化。: (onom.) dong

Synonyms

1 item

• 万一 wàn yī 万一 wàn yī just in case 表示假设或条件，但'一旦'多用于某个事件发生后引发的结果，'万一'强调可能性很小的假设。: just in case

Usage notes

Common mistakes

'一旦' is often used with 就 to express 'once...then...', as in 一旦开始就不能停止。

Example Sentences

1 shown

一旦 下雨，比赛就会取消。

Once it rains, the match will be canceled.

AI-generated examples are marked with this icon.

Child Words of 一旦

• 一 一 yī: one
• 旦 旦 dàn: (literary) dawn; daybreak