一旦
yī​dàn HSK5

once

一旦 yī​dàn
once conjunction
in case something happens; if one day; whenever; used to introduce a hypothetical situation or a condition that leads to a specific result

一旦你成为父母，一切都会改变。

yī​dàn nǐ chéng​wéi fù​mǔ, yī​qiè dōu​huì gǎi​biàn.

Once you become a parent, everything changes.

in a single day
in a very short time; within a single day

Frequency
Movie subtitles
87.1 per million appears in 31% of films
Written text
81.9 per million

Details
HSK 2.0
Level 5
HSK 3.0
Level 5

Cross-References

Same as

Sources
Frequency data
SUBTLEX-CHBCC Corpus (BLCU)