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a bleeding heart
A person who shows an overwhelming and often ostentatious display of sympathy, especially for those perceived as victims. He only voted for the tax increase because he's a bleeding heart. He really believes all of that extra money is going to help the homeless.
Fig. someone, usually considered politically liberal or leftist, who is very emotional about certain political issues, such as endangered species, downtrodden people, the suffering poor, etc. Bob is such a bleeding heart. No cause is too far out for him.
bleeding hearta person considered to be dangerously soft-hearted, typically someone too liberal or left-wing in their political beliefs. informal
2005 DVD Verdict Ed Bannon is the lone voice of antagonistic reason in an army filled with lily-livered bleeding hearts.
An excessively sympathetic or tender-hearted individual. The adjective bleeding has been used figuratively for full of anguish from pity or compassion since the late 1500s. Edmund Spenser so used it in The Faerie Queene: “These bleeding words she gan to say.” The cliché is much newer, dating from the first half of the twentieth century. I. T. Ross had it in Murder out of School (1960), “A lot of bleeding-hearts got the idea they knew about everything.”