There are 2 main definitions of kiss ass in English:

kiss ass1

North American vulgar slang Behave in an obsequious or sycophantic way.
See parent entry: kiss

Definition of kiss ass in:

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There are 2 main definitions of kiss ass in English:

kiss-ass2

Line breaks: kiss-ass

adjective

North American vulgar slang
Having or showing an obsequious or sycophantic eagerness to please.

Definition of kiss ass in: