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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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