一旦
Once (if ever); as soon as
一旦 A 就 B: once A happens, B follows.
In stories
一旦发现电池冒烟、鼓包或者发出异响，应立即远离，并拨打火警电话119。
电动车为什么不能进电梯？ · Why are e-bikes banned from lifts in China? HSK 6
原来他忽然想到：今日虽然逍遥，将来年老体衰，暗中自有阎王管着，一旦身亡，岂不白活一世？
What does 一旦 (yídàn) mean in Chinese?
Once (if ever); as soon as. 一旦 A 就 B: once A happens, B follows.
How common is 一旦?
It comes up in 2 readings of the 392 stories and articles in our free Library.
Does it correct my mistakes?
No. It shows which patterns a text uses and what each one does; it doesn’t mark errors. Paste a sentence you wrote to see whether it uses the pattern you meant.
More free tools
Patterns found by our own parser; lines from our free Library.