- code word (for something)
a word or phrase with a secret meaning that is used instead of the usual name for something They were asked to bring ‘cigars’ to the meeting, a code word for guns. 他们被要求带“雪茄”参加会议，这是枪支的代名词。 The police use code words for their major operations. 警察在重大行动中使用代号。