diktat
noun [ C or U ] disapproving uk/ˈdɪk.tæt/ us/ˈdɪk.tæt/
死命令;勒令
an order that must be obeyed, or the act of giving such an order
The coach issued a diktat that all team members must attend early-morning practice. 教练下了死命令，全体队员必须参加晨练。
The occupying force ruled by diktat. 占领军实行严格的军事统治。