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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
1520-30; imitative
Related forms
thwacker, noun
outthwack, verb (used with object)
unthwacked, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for thwack
Historical Examples
  • A dense cloud of dust rises over them, and through the dim obscurity one hears the ceaseless sound of the thwack!

  • She struck one plank a thwack with the small axe she carried in her hand.

    Green Eyes Roy J. Snell
  • Geddie leaped high and caught the roll with a sounding "thwack."

  • Then, above the murmur from the temple, he heard a sound in the corridor—a thwack.

    Caravans By Night Harry Hervey
  • A thwack upon his shoulders, almost as loud as that of the peel an hour before, sent him half out of bed.

    Pippin; A Wandering Flame Laura E. Richards
  • He was stronger than the prince, otherwise there wouldn't have been a table to thwack.

    The Princess Elopes Harold MacGrath
  • After a few passes Robin feinted, and, catching the other unawares, dealt him a thwack with the flat of his blade.

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

  • thwack fell the broom, and, releasing Joan, the man sought to protect his head with his arms.

    The Golden Woman Ridgwell Cullum
  • Lucifer unhinged the door with one thwack of his big tail, and it fell to the ground with Blow-hard, and broke one of his legs.

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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