Definition of "grin" []

• To smile broadly, often baring the teeth, as in amusement, glee, embarrassment, or other strong emotion. (verb-intransitive)
• To express with a grin: I grinned my approval. (verb-transitive)
• The act of grinning. (noun)
• The facial expression produced by grinning. (noun)
• To smile with the lips drawn back revealing the teeth or express (something) by such a smile (verb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• To draw back the lips revealing the teeth, as in a snarl or grimace (verb)
• A broad smile (noun)
• A snarl or grimace (noun)

www.Collinsdictionary.com (c) HarperCollins Publishers Ltd 2016

• "Ethan's cheeky grin put a smile on my face too! yargggh … looks like I won't make it before Christmas, but I can do this tag after, yea? since it's not totally seasonal … * grin*"
• "“Two wrongs don't make a right?” he says, knowing his grin is a bit lopsided and sad."
• "Olyphant's Cheshire grin is delicious as the office women swoon, comparing him to Josh Duhamel while Kevin suggests, "He's like a better-looking Andy.""