'blowback' definitions:

Definition of 'blowback'

From: WordNet
noun
The backward escape of gases and unburned gunpowder after a gun is fired [syn: blowback, backfire]
noun
Misinformation resulting from the recirculation into the source country of disinformation previously planted abroad by that country's intelligence service

Definition of 'blowback'

From: GCIDE
  • blowback \blowback\ n.
  • 1. the backward escape of unburned gunpowder after a shot. [WordNet 1.5]