Meaning of “grin” in the English Dictionary

"grin" in British English

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grinnoun [ C ]

uk /ɡrɪn/ us /ɡrɪn/

grinverb [ I ]

uk /ɡrɪn/ us /ɡrɪn/ -nn-

(Definition of “grin” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"grin" in American English

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grinnoun [ C ]

us /ɡrɪn/

a wide smile:

He flashed a big grin and gave us a thumbs up.
grin
verb [ I ] us /ɡrɪn/ -nn-

He grinned and waved to us.

(Definition of “grin” from the Cambridge Academic Content Dictionary © Cambridge University Press)