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gobsmacked

[gob-smakt]
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adjective Chiefly British Informal.
  1. utterly astounded; astonished.
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Origin of gobsmacked

gob3 + smack2 + -ed2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for gob-smacked

gobsmacked

adjective
  1. British slang astounded; astonished
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Word Origin

C20: from gob ³ + smack ²
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 gob-smacked

gobsmacked

adj.

by 1990, U.K. slang, from gob "mouth" + past participle of smack.

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Online Etymology Dictionary, © 2010 Douglas Harper