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Definition of backfire
verb [no object]
1(of an engine) undergo a mistimed explosion in the cylinder or exhaust:a car backfired in the road 2(of a plan or action) rebound adversely on the originator; have the opposite effect to what was intended:overzealous publicity backfired on her
1a mistimed explosion in the cylinder or exhaust of a vehicle or engine. 2a fire set intentionally to arrest the progress of an approaching fire by creating a burned area in its path, thus depriving the fire of fuel.