一旦

yídàn

in case (sth happens); if; once (sth happens, then...)

adverb HSK 3.0 · Band 5

Watch it being written

Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.

一
旦

Build with these blocks

Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.

一

See it in sentences

一旦开始就要坚持。

Once started, you must persist.

一旦错过班车还能回家吗？

If you miss the shuttle can you still get home?