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ass1

[as]
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noun
  1. a long-eared, slow, patient, sure-footed domesticated mammal, Equus asinus, related to the horse, used chiefly as a beast of burden.
  2. any wild species of the genus Equus, as the onager.
  3. a stupid, foolish, or stubborn person.
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Origin of ass1

before 1000; Middle English asse, Old English assa, probably hypocoristic form based on Old Irish asan < Latin asinus; akin to Greek ónos ass
Related formsass·like, adjective

ass2

[as]
noun Vulgar.
  1. the buttocks.
  2. the rectum.
  3. Slang. sexual intercourse.
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Origin of ass2

before 1000; var of arse, with loss of r before s, as in passel, cuss, etc.; Middle English ars, er(e)s, Old English ærs, ears; cognate with Old Frisian ers, Dutch aars, Old Norse, Middle Low German, Old Saxon, Old High German ars (German Arsch), Greek órrhos, Armenian or̄kh, Hittite arras; akin to Greek ourā́, Old Irish err tail

ass.

-ass

  1. a combining form of ass in the sense of ‘stupid person’ or ‘the buttocks’, used in slang words as an intensifier or with disparaging intent: big-ass; stupid-ass.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ass

ass1

noun
  1. either of two perissodactyl mammals of the horse family (Equidae), Equus asinus (African wild ass) or E. hemionus (Asiatic wild ass). They are hardy and sure-footed, having longer ears than the horseRelated adjective: asinine
  2. (not in technical use) the domesticated variety of the African wild ass; donkey
  3. a foolish or ridiculously pompous person
  4. not within an ass's roar of Irish informal not close to obtaining, winning, etcshe wasn't within an ass's roar of it
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Word Origin

Old English assa, probably from Old Irish asan, from Latin asinus; related to Greek onos ass

ass2

noun
  1. mainly US and Canadian slang the buttocks
  2. mainly US and Canadian slang the anus
  3. mainly US and Canadian offensive, slang sexual intercourse or a woman considered sexually (esp in the phrase piece of ass)
  4. cover one's ass slang, mainly US and Canadian to take such action as one considers necessary to avoid censure, ridicule, etc at a later time
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Word Origin

Old English ærs; see arse
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 ass

n.1

beast of burden, Old English assa (Old Northumbrian assal, assald) "he-ass," probably from Old Celtic *as(s)in "donkey," which (with German esel, Gothic asilus, Lithuanian asilas, Old Church Slavonic osl) ultimately is from Latin asinus, which is probably of Middle Eastern origin (cf. Sumerian ansu).

For al schal deie and al schal passe, Als wel a Leoun as an asse. [John Gower, "Confessio Amantis," 1393]

Since ancient Greek times, in fables and parables, the animal typified clumsiness and stupidity (hence asshead, late 15c., etc.). To make an ass of oneself is from 1580s. Asses' Bridge (c.1780), from Latin Pons Asinorum, is fifth proposition of first book of Euclid's "Elements." In Middle English, someone uncomprehending or unappreciative would be lik an asse that listeth on a harpe. In 15c., an ass man was a donkey driver.

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n.2

slang for "backside," first attested 1860 in nautical slang, in popular use from 1930; chiefly U.S.; from dialectal variant pronunciation of arse (q.v.). The loss of -r- before -s- attested in several other words (e.g. burst/bust, curse/cuss, horse/hoss, barse/bass). Indirect evidence of the change from arse to ass can be traced to 1785 (in euphemistic avoidance of ass "donkey" by polite speakers) and perhaps to Shakespeare, if Nick Bottom transformed into a donkey in "A Midsummer Night's Dream" (1594) is the word-play some think it is. Meaning "woman regarded as a sexual object" is from 1942. Colloquial (one's) ass "one's self, one's person" attested by 1958.

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Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with ass

ass

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.