狐假虎威[hú jiǎ hǔ wēi]:fox/fake/tiger/power
搜捕 sōu bǔ:Search and arrest
野兽 yě shòu:beast;wild animals
违背 wéi bèi:violate; go against; run counter to
旨意zhǐ yì:order; decree; intention
信以为真 xìn yǐ wéi zhēn:take sth. for gospel truth;accept sth. as true
This idiom means relying on another's power to bully or frighten others.