Main Entry: grin

Pronunciation: \ˈgrin\

Function: intransitive verb

Inflected Form(s): grinned; grin·ning

Etymology: Middle English grennen, from Old English grennian; akin to Old High German grennen to snarl

Date: before 12th century

: to draw back the lips so as to show the teeth especially in amusement or laughter; broadly : smile

— grin noun

— grin·ner noun

— grin·ning·ly \ˈgri-niŋ-lē\ adverb