Meaning of “smirk” in the English Dictionary

(Definition of “smirk” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"smirk" in American English

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smirkverb [ I ]

us /smɜrk/

to smile in a way that expresses satisfaction with yourself or pleasure about having done something or knowing something that is not known by someone else:

When she told him he was cool, he just smirked.
noun [ C ] us /smɜrk/

Her lips curled into a smirk.

(Definition of “smirk” from the Cambridge Academic Content Dictionary © Cambridge University Press)