SEARCH
THE GRAPH.

From Middle English asse, from Old English assa, back-formed from assen (“she-ass”), from Celtic (compare Old Irish asan, Old Cornish asen), from Latin asinus. Displaced Old English esol, from Proto-West Germanic *asil, also a loanword from the same Latin word. Sense “stupid person” from the animal's reputation for stubbornness, going back to antiquity (compare Latin asinus (“slow-witted person”)).

Variant of arse; used chiefly in North America. Ultimately from Middle English ars, ers, from Old English ærs, ears, from Proto-West Germanic *ars, from Proto-Germanic *arsaz (compare Old High German ars (German Arsch), Old Norse ars, Old Frisian ers), from Proto-Indo-European *h₁órsos (compare Ancient Greek ὄρρος (órrhos)). Etymological notes Contrary to the widespread belief of this being a euphemism, it arose as a pronunciation spelling (of the older form arse still used in the UK, Australia, New Zealand, etc.) that shows the assimilation of /ɹ/ before coronal consonants (especially /s/), a phenomenon that has been present in nonstandard speech from the Middle English period onwards; this is distinct from the later phenomenon of non-rhoticity as /ɹ/ was lost before it could modify the preceding vowel. Other instances of this phenomenon (some of which retained both spellings with different meanings) include cuss from curse, gash from garsh, bass (“fish”) from barse, bust from burst, passel from parcel; see :Category:English terms with assimilation of historic /ɹ/ for a more extensive list.