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English definition of “smile”

smile

noun [C]  /smɑɪl/ us  
an expression on the face in which the ends of the mouth curve up slightly, often with the lips moving apart so that the teeth can be seen, expressing esp. happiness, pleasure, amusement, or a friendly feeling: a big/happy/pretty smile a smile of joy/satisfaction/amusement We exchanged smiles as we passed in the hallway.
smiley
adjective  /ˈsmɑɪ·li/ us  
infml He’s a very smiley, friendly baby.

smile

verb [I/T]  /smɑɪl/ us  
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 from the Cambridge Academic Content Dictionary © Cambridge University Press)
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