grinning

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a facial expression characterized by turning up the corners of the mouth;
usually shows pleasure or amusement (Freq. 2)
• Syn:
smile, smiling, grin
• Derivationally related forms:
grin, grin (for: grin), smiling (for: smiling), smile (for: smiling), smile (for: smile)
• Hypernyms:
facial expression, facial gesture
• Hyponyms:
simper, smirk