Definition of grin noun from the Oxford Advanced Learner's Dictionary

 

grin

 noun
noun
BrE BrE//ɡrɪn//
 
; NAmE NAmE//ɡrɪn//
 
Facial expressions
 
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a wide smile She gave a broad grin. a wry/sheepish grin ‘No,’ he said with a grin. Take that grin off your face! See related entries: Facial expressions Word Origin Old English grennian ‘bare the teeth in pain or anger’, of Germanic origin; probably related to groan.Extra examples A mischievous grin spread across the little girl’s face. Edmund looked up with an impish grin. He forced a grin despite feeling angry. He gave the photographer a big grin. He grinned his adorable grin. He had a cheeky grin. Her grin turned into a frown. Her lips started to form a slight grin. His wry grin faded. I wondered why Dad had a grin on his face. I’ll soon wipe that silly grin off her face. She tried to stifle a grin. Take that grin off your face! The old man’s face broke into a grin. a grin at his wife a grin of triumph a grin tugging at the corners of his lips She gave a broad grin.
See the Oxford Advanced American Dictionary entry: grin