Definition of backfist
: a punch thrown by a fighter with the back of the fist usually at the end of a quick spinning movement The instructor threw a backfist at three-quarter speed, but this time the student wasn't fast enough. — Dr. Thomas J. Nardi, MA Training, July 1995 The 39-year-old Le set the tone early …, landing a spinning backfist early in the first round that put Silva down. — Associated Press, 20 Nov. 2011
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