pre·nup·tial a·gree·ment /priːˌnʌpʃəl əˈɡriːmənt/ (also pre-nup /ˈpriːnʌp/ informal) noun [countableC] a legal document that is written before a man and a woman get married, in which they agree things such as how much money each will get if they divorce 婚前协议