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