万一 wànyī HSK4 in case Origin Definitions Defs Strokes Stroke Words Sentences Sents 以防万一 yǐfángwànyī just in case to guard against the unexpected or any eventualities不怕一万，就怕万一 bùpàyīwàn, jiùpàwànyī precaution It is better to be safe than sorry; one should be prepared for even the most unlikely negative outcome.