kiss (somebody's) assAmerican EnglishAmE informal not politeFRIENDLY to be too nice to someone who can give you something you want – used to show disapproval 拍(某人)马屁,巴结(某人)〔含贬义〕kiss (somebody’s) ass• Boyd will kiss anybody's ass if he thinks it'll get him promoted.
→ kiss (somebody’s) ass at kiss1(4)