If someone is grinning like a ~ or like the ~, they are smiling very widely.
He had a grin on his face like a Cheshire Cat.
...a Cheshire Cat smile.
PHRASE
If someone is grinning like a ~ or like the ~, they are smiling very widely.
He had a grin on his face like a Cheshire Cat.
...a Cheshire Cat smile.
PHRASE
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012