kiss someone's ass

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kiss (one's) ass

rude slang To flatter, fawn over, or eagerly agree with one, especially a person of higher authority, as a means of currying favor. Primarily heard in US. It's no wonder you're the teacher's favorite from the way you kiss her ass! Look, it's just the nature of this business that sometimes you have to kiss ass if you want to get ahead.
See also: ass, kiss
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

kiss someone’s ass

tv. to fawn over someone; to flatter and curry favor with someone. (Usually objectionable.) What does he expect me to do? Kiss his ass?
See also: ass, kiss
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.