1. A facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement
   "His grinning face betrayed his excitement about the surprise party";
   - smile, smiling, grin

1. To draw back the lips and reveal the teeth, in a smile, grimace, or snarl
   "He grinned widely when he saw his old friend"

Type of: facial expression, facial gesture, smile

Encyclopedia: Grinning