To control a person in authority and issue orders in their name to serve one's own agenda; to manipulate a superior to command others.
小李仗着自己是部门经理的秘书，经常挟天子以令天下，让其他同事处理他的私人事务。
Li, relying on his position as the department manager's secretary, often leveraged the manager's authority to command others, making colleagues handle his personal affairs.
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