Also found in: Thesaurus, Idioms.


v. grinned, grin·ning, grins
To smile broadly, often baring the teeth, as in amusement, glee, embarrassment, or other strong emotion.
To express with a grin: I grinned my approval.
1. The act of grinning.
2. The facial expression produced by grinning.

[Middle English grennen, to grimace, from Old English grennian.]

grin′ner n.
grin′ning·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


in a grinning manner
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
He seized it with his left hand, with a quick pull and twist wrenched it off, and grinningly tossed it, as a joke, into the pandanus basket which still his wife with one hand held before him while with the other she clutched her forehead bleeding from a flying fragment of pistol.
Someone close but senior in years grinningly remarked, 'Ah!
In addition to facilitating nuclear talks, Oman helped to secure the release of three American hikers detained in Iran in September 2011, by paying their million-dollar bail an amount Omanis grinningly call "an investment in peace".
Indeed, the signature sight gag which opens "A Night in Casablanca" (1946) was Tashlin's: Harpo is leaning against a wall and, when kidded about holding up the building, the silent Marx grinningly moves and said structure collapses.