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when someone suddenly backs off after realising they are in a situation they can't handle.
Joe had a fall-back attack and ran from the fight after he realised how big the other guy was.

Skydiver1: I didn't think we'd be up this high.

Skydiver2: I can't jump. I think I'm having a fall-back attack.
by St. Kae May 08, 2009
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