rob the cradle
US /rɑb ðə ˈkreɪ.dəl/
UK /rɑb ðə ˈkreɪ.dəl/

1.
老牛吃嫩草, 與比自己年輕很多的人談戀愛
to have a romantic relationship with someone who is much younger than oneself
:
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Some people might say he's robbing the cradle, but they seem very happy together.
有些人可能會說他老牛吃嫩草,但他們看起來很幸福。
•
She's always been attracted to younger men, so she's known for robbing the cradle.
她一直被年輕男性吸引,所以她以老牛吃嫩草而聞名。