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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(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
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!)
Also, kiss up to. Seek or gain favor by fawning or flattery, as in I am not going to kiss as to get the raise I deserve, or If I could find a good way to kiss up to the publisher, my book would be well promoted. The first, a vulgar slangy usage, was first recorded in 1705 as kiss arse, which is still the British usage. The variant, a euphemistic blend of kiss ass and suck up to, dates from the late 1900s.
kiss assVulgar Slang
To act submissively or obsequiously in order to gain favor.