rob the cradle

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释义
老牛吃嫩草
Have a romantic or sexual relationship with someone much younger than oneself,

例句
Monica: OK, he's a senior in college.
Ross: College? Wow...
Joey: Rob that cradle.（Friends）
莫妮卡：好吧，他是个大四的学生。
罗斯：大学？哇哦。
乔伊：老牛吃嫩草啊。（老友记）