kiss (one'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.

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.
See also: ass, kiss
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

kiss ass

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.
See also: ass, kiss
The American Heritage® Dictionary of Idioms by Christine Ammer.

kiss ass

behave in an obsequious or sycophantic way. North American vulgar slang
See also: ass, kiss
Farlex Partner Idioms Dictionary

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

kiss ass

Vulgar Slang
To act submissively or obsequiously in order to gain favor.
See also: ass, kiss
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • lick (someone's) boots
  • lick boots
  • lick somebody's boots
  • lick someone's boots