乘人不备 chéngrénbùbèi to take someone by surprise Origin Definitions Defs Strokes Stroke Words Sentences Sents 乘 chéng to take advantage of To avail oneself of an opportunity, circumstances, or someone's weakness.人 rén nounpronoun other people other people; others; another person不备 不備 bùbèi off guard not prepared; caught off guard