Unfailingly, he would be grinning from ear to ear; I would be looking away, trying to focus my blurry drunk vision.
One measly year later, Pam woke to find a naked Ewing grinning at her in the shower.
He shot a grinning parishioner outside the Perfecting Church.
Old English grennian "show the teeth" (in pain or anger), common Germanic (cf. Old Norse grenja "to howl," grina "to grin;" Dutch grienen "to whine;" German greinen "to cry"), from PIE root *ghrei- "be open." Sense of "bare the teeth in a broad smile" is late 15c., perhaps via the notion of "forced or unnatural smile." Related: Grinned; grinning.
1630s, from grin (v.).