rat on （〈美〉亦作rat someone out） informal inform on (someone) to a person in a position of authority 告发： men will literally choose death over ratting out another prisoner. 男人们确实宁肯死掉也不愿告发其他囚犯。 ■ break (an agreement or promise) 撕毁（协议）; 违背（诺言）： he accused the government of ratting on an earlier pledge. 他指控政府不兑现早先的承诺。 |