Definition from Wiktionary, the free dictionary
bleeder (plural bleeders)
- A person who is easily made to bleed, or who bleeds in unusually large amounts, particularly a hemophiliac.
- Anything that saps a resource produced by something else.
- A valve designed to release a small amount of excess pressure from a system.
- (UK, slang, derogatory) A troublesome fellow; a blighter.