the fox borrows the tiger's terror (by walking in the latter's company)―bully people by flaunting one's powerful connections; borrow power to do evil; swagger about in borrowed plumes; browbeat others by virtue of sb else's influence
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不要以为你爸是校长,你就可以狐假虎威,为所欲为。
Don't think you can do whatever you want just because your father is the headmaster of our school.