v. & n.
v. (grinned, grinning) 1 intr. a smile broadly, showing the teeth. b make a forced, unrestrained, or stupid smile. 2 tr. express by grinning (grinned his satisfaction).
n. the act or action of grinning. grin and bear it take pain or misfortune stoically. grinner n. grinningly adv.
[ OE grennian f. Gmc ]