Definition of ass-kissing in US English:

ass-kissing

noun

North American
vulgar slang
  • The use of compliments, flattery, or other obsequious behavior in order to gain favor.

    obsequiousness, sycophancy, excessive deference, subservience, submissiveness, fawning, toadyism, toadying, grovelling, cringing, unctuousness, oiliness, abjectness, abjection, cravenness, slavishness, humility, self-abasement
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Pronunciation

ass-kissing

/ˈasˌkisiNG/