intransitive verbgrinned, grin′ning
- to smile broadly as in amusement or pleasure, or, sometimes, in embarrassment
- to draw back the lips and show the teeth in pain, scorn, etc.
Origin of grinMiddle English grennen from Old English grennian, to gnash or bare the teeth, akin to Old High German grennan, to mutter, German greinen, to weep
grin and bear it