Longman Dictionary of Contemporary English homepage

grin

2 noun
     
grin2 [countable]
a wide smile:
He came into the room with a friendly grin on his face.
wide/broad/big etc grin
'Of course,' he agreed with a wide grin.

➔ wipe the grin off somebody's face

at wipe1 (7)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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