打死老虎

Explanation: Lost the power and influence of people criticize metaphor 　　Usage: Verb-object type; as object, attribute; containing derogatory 　　Source: Lu Xun's "grave of" fair play "should be put on hold": "I thought 'dead tigers' who fitted mood for Yong, containing quite funny, although inevitably there is suspicion of cowardice, but mood was very cute." Thesaurus:  beat a drowning dog