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kiss someone's ass
Sl. to fawn over someone; to flatter and curry favor with someone. (Potentially offensive. Use ass with discretion.) What does he expect me to do? Kiss his ass? I won't kiss your ass for anything.
kiss (somebody's) ass(American very informal)
to try too hard to please someone and to agree with everything they say, in a way which other people find unpleasant If you want promotion around here, you're going to have to kiss ass. (American taboo!)
kiss (somebody's) ass(rude)
to praise someone more than is reasonable I usually have to kiss ass just to get these musicians to show up.
Usage notes: usually said about praise intended to make someone like you or do something you want