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English definition of “smile”

smile

verb [I/T]    /smɑɪl/
to make a happy or friendly expression in which the ends of the mouth curve up slightly : [I] I couldn’t help smiling . [I] When he smiled at me, I knew everything was OK. [I] She smiled to herself. [T] He smiled a happy smile.
(Definition of smile verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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