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"grin" is also used as a crossword clue. If that's what you saw, the answer is often smile (5 letters).
Definitions
to draw back the lips and reveal the teeth, in a smile, grimace, or snarl
Word origin
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.
Used in a sentence
“When the ceremony was finished a wide grin broke across his face, and it was that grin she saw, relieved and happy all at once.”
“When my son appeared at the door the next day with his schoolbag on his back, the Professor broke into a wide grin and opened his arms to embrace him.”
“Why do you grin? Did I say something funny?”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Wide smile”4 letters
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