一旦 (yídàn) · once

一旦 (yídàn) means “once; in case; if ever”. It is written with 2 characters: 一 (one) + 旦 (dawn). It is an old HSK 5 word (HSK 2.0).

How 一旦 is built

The characters

一 yī · one

What 一 is made of

一 is not built from smaller parts; it is written with 1 strokes.

Origin hint: Represents heaven (天), earth (旦), or the number 1 (from the Make Me a Hanzi dataset; treat as a memory aid where history is uncertain)

旦 dàn · dawn

What 旦 is made of

日rì — sun; day
- 口kǒu — mouth
  - 冂 — frame
  - 一 — horizontal stroke
- 一 — horizontal stroke
一 — horizontal stroke

Example sentences

一旦下雨，比赛就取消。Yídàn xiàyǔ, bǐsài jiù qǔxiāo.If it rains, the match will be cancelled.

一旦决定了，就不要后悔。Yídàn juédìng le, jiù búyào hòuhuǐ.Once you've decided, don't regret it.

Questions about 一旦

What does 一旦 mean?

一旦 (yídàn) means “once; in case; if ever”.

How do you pronounce 一旦?

一旦 is pronounced yídàn.

Which HSK level is 一旦?

一旦 is in Old HSK 5.

Related words

Learn 一旦 with its group

It is part of Old HSK 5 · Group 111: a short group with quick checks and spaced repeats.

Open the group