Then, with a grin, “And we all know how degenerate those people are.”
“Made in Aleppo,” he proclaimed with a grin, holding a bomb laced with crooked nails and screws along its perimeter.
No,” the president replied with a grin over sustained laughter throughout the room, “but it means the Vatican is.
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.).