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backbiting (n.)c. 1200, bacbitunge, "the sin of secretly attacking one's character or reputation through envy," from back (adj. or n.) + biting. Related: back-bite (v.) early 14c.; back-biter (c. 1200). The notion is of injury in a manner comparable to biting from behind. As an adjective Old English had bæcslitol; another old word for it was back-wounding (c. 1600).
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backdoor (adj.)also back-door, "devious, shady, illegal," 1640s. The notion is of business done out of public view. The noun back door in the literal sense is from 1520s, from back (adj.) + door. The association with sodomy is from at least 19c.; compare also back-door man "a married woman's lover," African-American vernacular, early 20c.
Related entries & more backer (n.)"supporter, one who aids and abets," 1580s, agent noun from back (v.).
Related entries & more backfire (n.)1832, American English, originally "a fire deliberately lit ahead of an advancing wildfire to deprive it of fuel," from back (adj.) + fire (n.). As a verb in this sense, recorded from 1886. The noun meaning "premature ignition in an internal-combustion engine" is first recorded 1897. AS a verb, of schemes, plans, etc., "to affect the initiator rather than the intended object" it is attested from 1912, a figurative use from the accidental back-firing of firearms.
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