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[thwak] /θwæk/
verb (used with object)
to strike or beat vigorously with something flat; whack.
a sharp blow with something flat.
Origin of thwack
First recorded in 1520-30; imitative
Related forms
thwacker, noun
outthwack, verb (used with object)
unthwacked, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for thwack
Historical Examples
  • Geddie leaped high and caught the roll with a sounding "thwack."

  • His wife, taken aback, started up and gave him a thwack on the back.

    Pelle the Conqueror, Complete Martin Anderson Nexo
  • She struck one plank a thwack with the small axe she carried in her hand.

    Green Eyes Roy J. Snell
  • Then, above the murmur from the temple, he heard a sound in the corridor—a thwack.

    Caravans By Night Harry Hervey
  • Jock's hand came down with a thwack on the papers before him.

    Personality Plus Edna Ferber
  • He was stronger than the prince, otherwise there wouldn't have been a table to thwack.

    The Princess Elopes

    Harold MacGrath
  • Meanwhile, Ben sweeps on like the wind, hearkening even in his haste for the welcome "thwack, thwack" of his father's axe.

  • Tch, ye baggage, dinna tell me what I ken, chance I fetch ye a thwack wi th poss-stick!

    Back o' the Moon Oliver Onions
  • Suddenly something shot out into the air from above, falling with a ‘thwack’ against the face of the cliff.

    Renshaw Fanning's Quest Bertram Mitford
  • Blow upon blow, thwack upon thwack—they fought hand to hand until black rock and bulrush were all gone.

    The Indian Fairy Book Cornelius Mathews
British Dictionary definitions for thwack


to beat, hit, or flog, esp with something flat
  1. a blow with something flat
  2. the sound made by it
an exclamation imitative of this sound
Derived Forms
thwacker, noun
Word Origin
C16: 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
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Word Origin and History for thwack

"to hit hard with a stick," 1520s, of echoic origin. Related: Thwacked; thwacking. The noun is recorded from 1580s.

Online Etymology Dictionary, © 2010 Douglas Harper
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