1 [grin]
verb (used without object), grinned, grinning.
to smile broadly, especially as an indication of pleasure, amusement, or the like.
to draw back the lips so as to show the teeth, as a snarling dog or a person in pain.
to show or be exposed through an opening, crevice, etc.
verb (used with object), grinned, grinning.
to express or produce by grinning: The little boy grinned his approval of the gift.
a broad smile.
the act of producing a broad smile.
the act of withdrawing the lips and showing the teeth, as in anger or pain.

before 1000; Middle English grinnen, grennen, Old English grennian; cognate with Old High German grennan to mutter

grinner, noun
grinningly, adverb

1. See laugh. Unabridged


2 [grin]
Chiefly Scot. a snare like a running noose.
verb (used with object), grinned, grinning.
to catch in a nooselike snare.

before 900; Middle English grin(e), Old English grin, gryn Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grin (ɡrɪn)
vb , grins, grinning, grinned
1.  to smile with the lips drawn back revealing the teeth or express (something) by such a smile: to grin a welcome
2.  (intr) to draw back the lips revealing the teeth, as in a snarl or grimace
3.  informal grin and bear it to suffer trouble or hardship without complaint
4.  a broad smile
5.  a snarl or grimace
[Old English grennian; related to Old High German grennen to snarl, Old Norse grenja to howl; see grunt]
adj, —n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. grennian "show the teeth" (in pain or anger), common Gmc. (cf. O.N. grenja "to howl," grina "to grin;" Du. grienen "to whine;" Ger. greinen "to cry"), from PIE base *ghrei- "be open." Sense of "bare the teeth in a broad smile" is c.1480, perhaps via the notion of "forced or unnatural smile." the
noun is first attested 1635.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Though hobbled by strokes and blindness, he now grinned from ear to ear at the
  prospect of power.
They grinned and ordered from the shop next door, refusing to take our money.
But when she began to look about her, and to speak to me, he nodded his head
  and grinned several times.
She grinned and told me about the story described in this news report.
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