Where does “ass-backwards” come from?

ass-backwards (English) comes from English backwards, from English -s, from English ’s, from English Kingstown, from English town, from Middle English toun, from Middle English ende, from Old English ende — on, onto.

ass-backwards (English): Oriented backwards, particularly after a mishap;...

Definitions

  1. Oriented backwards, particularly after a mishap;...

Ancestry of “ass-backwards”, step by step

ass-backwards traces back through two separate lines of ancestry.

via English backwards

StepLanguageWordMeaning
1EnglishbackwardsOriented toward the back; Reversed; Behind...
2English-sUsed to form regular plurals of nouns; Used to...
3English’s
4EnglishKingstownOS grid ref NY3959
5EnglishtownA settlement; an area with residential districts,...
6Middle Englishtountown
7Middle EnglishendeThe end or finishing of a thing; the terminal...
8Old Englishendeend, limit, border, corner
9Proto-Germanicandiin addition, furthermore, and
10Proto-Indo-Europeanh₂éntiopposite; near; in front
11Proto-Indo-Europeanh₂éntsforehead; front
12Proto-Indo-Europeanh₂ent-face; forehead; front
13Proto-Indo-Europeanh₂en-on, onto

via English ass

StepLanguageWordMeaning
1EnglishassAny of several species of horse-like animals,...
2Middle EnglishasseAlternative form of axen
3Old Englishassaass, donkey
4Old Englishassenshe-ass
5Latinasinusa donkey, an ass; an ass, an idiot, a dolt, a...
6Latinacinusa berry, especially the grape; the seed of a...
7Latinaciessharp edge or point; battle line; battle,...
8Proto-Indo-Europeanh₂eḱ-sharp
Every word from Proto-Indo-European h₂en-
ass-backwards — Etymology, Origin & Word History | Etymology Explorer