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jackass

[jak-as]
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noun
  1. a male donkey.
  2. a contemptibly foolish or stupid person; dolt; blockhead; ass.
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Origin of jackass

First recorded in 1720–30; jack1 + ass1
Related formsjack·ass·er·y, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for jackass

jackass

noun
  1. a male donkey
  2. a stupid person; fool
  3. laughing jackass another name for kookaburra
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Word Origin

C18: from jack 1 (male) + ass 1
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 jackass

n.

mule ass, 1727, from jack (n.) + ass (n.1). Meaning "stupid person" is attested from 1823.

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Online Etymology Dictionary, © 2010 Douglas Harper