mouth off 〈美口〉 1. 回嘴，顶嘴 I never mouth off to teachers. 我从不同老师顶嘴。 2. (尤指在公开场合)毫无顾忌(或令人信服)地发表自己的意见，谈论 He likes to mouth off in front of his friends. 他喜欢在朋友面前大发议论。 She was scratched after a former swain mouthed off about their life together. 她从前的一个恋人公然谈论他们曾经同居，于是人家就不要她了。 3. 大声指责或漫骂 (at)