The situation where a gun fails to fire when it "should" is called a hang fire.
The term hang fire can also be applied to just a significant delay in the discarge of a firearm after pulling the trigger as well as the complete failure of the gun to fire. Additionally, when a fuse burns "too long" before igniting explosives, or if explosives fail to go off after a "reasonable" time following the lighting of the fuse, that is also called a hang fire.
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