grin
n. countablen. a wide smile that shows you are very happy or find something funny. It often shows your teeth.
n. a broad smile that typically reveals the teeth, indicating amusement, satisfaction, or derision.
He has a wide grin on his face.
She couldn't hide her grin when she saw the surprise party her friends had planned.
The Cheshire Cat is famous for leaving its mischievous grin behind even after its body has completely vanished into thin air.
From Middle English grinnen, from Old English grennian, from Proto-West Germanic grannjōn, from Proto-Germanic granjōną. Related to groan. Compare to Middle High German grennen (“to mutter, complain”) and Danish grine (“to show one's teeth, to laugh”)
From Middle English grin, grinne, grine, from Old English grin (“snare, noose”), of uncertain origin, but probably from the merger of Proto-West Germanic garni and garnī (“intestine”), ultimately from Proto-Germanic garniz, garnō (“guts, intestine”). Related to English yarn.
Often used with the verbs 'wear', 'have', or 'give'.