smile smile /ˈsmaɪl/

noun

1. () A facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement  ( smiling , grinning , grin , smile )
   a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement
    A simple smile can brighten up someone's day
   A simple smile can brighten up someone's day
   
   

verb

1. () Change one's facial expression by spreading the lips, often to signal pleasure  ( smile )
   change one's facial expression by spreading the lips, often to signal pleasure
     The little girl flashed a bright smile at her parents.
   The little girl flashed a bright smile at her parents.
   
2. Express with a smile  ( smile )
   express with a smile
    She smiled her thanks
   She smiled her thanks