loudmouth
/ˈlaʊdmaʊθ/
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If you describe someone as a loudmouth, you are critical of them because they talk a lot, especially in an unpleasant, offensive, or stupid way. 高谈阔论者
noun [具体名词] 高声讲话的人
He is a loudmouth who cannot be trusted with secrets. 他是个多嘴多舌的人，不能相信他能为别人保守秘密。
