[ 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

thwack·er, nounout·thwack, verb (used with object)un·thwacked, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for thwack

British Dictionary definitions for thwack


/ (θwæk) /


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 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