lay down the law
明确规定或表达某种规则或要求
用于上级强制制定规则
英文释义
to assert one's authority or establish rules and expectations
例句
The manager laid down the law: no more personal calls during work hours.
典故来源
源自法律术语，指法官或权威人士正式宣布法律条文，后泛指强制规定规则。