also blow-back, 1883, in reference to flames in enclosed spaces (firearms, furnaces, etc.), from blow (v.1) + back (adv.). Sense in reference to convert actions, etc., is from 1978.

Unforeseen and undesirable results from a covert operation, rebounding on the originating agency with possible negative impacts on the security of networks or operations.

1. See Action, Blowback.2. In ammunition, a leakage of gas rearward between the case and chamber wall from the mouth of the case.

A hard copy enlargement of an image on microform. Most libraries provide reader-printer machines for enlarging and making copies of documents available on microfilm or microfiche. Also spelled blow ba [..]

A term coined by the CIA referring to the future negative unintended consequences of U.S. foreign policy, including covert operations. Many point to the Iran Hostage Crises in 1979 as being blowback by the Iranians for the U.S. support of the overthrow of Prime Minister Mohammad Mosaddeq in 1953.

Noun. A method of sharing a 'joint' between two people, with one person blowing and the other inhaling.

(n) the backward escape of gases and unburned gunpowder after a gun is fired(n) misinformation resulting from the recirculation into the source country of disinformation previously planted abroad by t [..]

A semi-automatic firearm whose breechblock and barrel are not mechanically locked together when fired. In such case the breechblock immediately begins to separate from the barrel upon firing. Blowback [..]

A term used in foreign policy/intelligence circles referring to the unintended consequences of foreign policy/military actions.

A type of action in an autoloading firearm where the breech is not locked. Rather, the recoil of the firing cartridge overcomes the inertia of a spring-loaded breechblock, forcing it back to cycle the [..]

Blowback refers to a semiautomatic pistol action in which the top (or “slide”) of the pistol is forced backwards by the gases expelled when a bullet cartridge is fired. The blowback motion ejects the spent round and loads the next round into the firing chamber.

(firearms) A type of action where the pressure from the fired cartridge blows a sliding mechanism backward to extract the fired cartridge, chamber another cartridge, and cock the hammer. An uninte [..]