grin like a Cheshire cat
面帶賊笑，展示出特別開心或者暗示有某種計謀或秘密
口語·形容神秘或得意的笑
英文釋義
to have a big, wide, and often mysterious or mischievous smile on one's face
例句
He grinned like a Cheshire cat after winning the lottery.
典故來源
源自《愛麗絲夢游仙境》中的柴郡貓，其笑容神秘且持久。