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Phrase(s): grin at someone or something
1. to smile a beaming smile at someone or something. • The entire class grinned at the camera. • I grinned at her and she turned away quickly. 2. to smile a beaming smile at the thought of, or mental picture of, someone or something. • He grinned at the thought of his coming home to his family. • He grinned at her as she gazed upon the diamond ring he had given her.
McGrawhill's American Idioms And Phrasal Verbs