back seat driver
爱指手画脚的人；不参与却喜欢在旁边指点的人
口语·形容爱指手画脚的人
英文释义
someone who offers unwanted or unnecessary advice or guidance
例句
My mom is such a back seat driver—she keeps telling me how to cook even though she's not in the kitchen.
典故来源
源自汽车后座乘客对司机指手画脚的行为，比喻爱干涉他人事务的人。