armchair critic
只坐在安逸的地方批评他人，而不亲自参与或尝试
口语·贬义·指纸上谈兵的批评者
英文释义
someone who offers opinions or criticism from a position of little or no practical experience or involvement
例句
Don't be an armchair critic; come help us with the project instead.
典故来源
源自'armchair'（扶手椅）象征舒适安逸，比喻坐在家里空谈而不实际参与的人。