See more synonyms for thwack on
  1. a sharp blow with something flat.

Origin of thwack

First recorded in 1520–30; imitative
Related formsthwack·er, nounout·thwack, verb (used with object)un·thwacked, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for thwack

blow, knock, pound, force, smite, bop, wallop, sock, bang, paddle, drive, thrash, smack, rap, thump, strike, whack

Examples from the Web for thwack

Historical Examples of thwack

  • 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

British Dictionary definitions for thwack


  1. to beat, hit, or flog, esp with something flat
    1. a blow with something flat
    2. the sound made by it
  1. an exclamation imitative of this sound
Derived Formsthwacker, noun

Word Origin for thwack

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

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