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一旦

HSK 5#1323 by frequencyradical 一

yī dàn["d","c"]

in case (sth happens); if; once (sth happens, then...); when; in a short time; in one day

Examples

坏习惯一旦被养成，便不能简单地改正。

Once you've formed a bad habit, you can't get rid of it easily.

你一旦不做个乖孩子，圣诞老人就不会来噢。

As soon as you start misbehaving, Father Christmas will not come to see you.

Part of the HSK 5 word list.

Learn 一旦 the way it sticks: in sentences built from words you already know, scheduled so you review right before you'd forget.

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Definitions adapted from CC-CEDICT (CC BY-SA 4.0, modified). Example sentences from Tatoeba (CC BY 2.0 FR). Frequency ranks from the BCC corpus. Full credits on the Attributions page.