wàn​yī HSK4

in case

万一 (萬一) wàn​yī
in case adverb
if by any chance; in the event that something unlikely happens

If it rains, we won't go.

contingency adverb
an eventuality or the possibility of an unforeseen emergency

Call me if you get lost.

Frequency

Movie subtitles
28.8 per million appears in 12% of films

Details

HSK 2.0
Level 5
HSK 3.0
Level 4

Sources

Definitions
CC-CEDICT
Frequency data
SUBTLEX-CH