Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: grennian

grin

1 verb
     
grin
grin1 [intransitive] past tense and past participle grinned, present participle grinning
1 to smile widely
grin at
She grinned at me, her eyes sparkling.
grin broadly/widely
He walked out of the pool, grinning widely.
grin like
He was grinning like an idiot (=grinning in a silly way).
grin from ear to ear (=grin very widely)
2

grin and bear it

to accept an unpleasant or difficult situation without complaining, usually because you realize there is nothing you can do to make it better

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