Definition of GRIN

to express an emotion (as amusement) by curving the lips upward <grinned at the kids' fooling around in the pool>
Synonyms beam, grin
Related Words laugh, simper; smirk, sneer
Near Antonyms grimace; frown, glare, gloom, glower, lower (also lour), scowl; pout, sulk

Seen & Heard

What made you want to look up grin? Please tell us where you read or heard it (including the quote, if possible).