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biff1

[bif]Slang.
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noun
  1. a blow; punch.
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verb (used with object)
  1. to hit; punch.
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Origin of biff1

An Americanism dating back to 1840–50; perhaps imitative

biff2

[bif]
noun
  1. biffy.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for biff

biff

noun
  1. a blow with the fist
  2. Irish school slang a blow to the palm of the hand with a strap or cane as a punishment
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verb
  1. (tr) to give (someone) such a blow
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Word Origin

C20: probably of imitative origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for biff

v.

"to hit," 1877, imitative (as a sound effect, from 1847). Related: Biffed; biffing. As a noun, attested from 1881.

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Online Etymology Dictionary, © 2010 Douglas Harper