Synonyms of grin
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beamIf you say that someone is beaming, you mean that they have a big smile on their face because they are happy, pleased, or proud about something.
• She beamed at her friend with undisguised admiration.
• She knew he had news, because of the beam on his face.
smileWhen you smile, the corners of your mouth curve up and you sometimes show your teeth. People smile when they are pleased or amused, or when they are being friendly.
• He smiled and waved.
Thesaurus for grin from the Collins English Thesaurus