תִּטְחַ֣ן לְאַחֵ֣ר אִשְׁתִּ֑י וְ֝עָלֶ֗יהָ יִכְרְע֥וּן אֲחֵרִֽין׃
就願我的妻子為別人推磨，願別人屈身伏在她身上。
Rashi
may my wife grind for someone else Our Sages explained this as an expression of sexual intercourse, as in (Jud. 16:21), “and he did grind in the prison house.”