Where does “arsewards” come from?

arsewards (English) comes from English wards, from English ward, from Middle English ward, from Old English weard, from Old English ōra, from Old English ēar, from Proto-Germanic ahaz, from Proto-Finnic ahtas — to constrict, tighten, compress; narrow, tight;...

Ancestry of “arsewards”, step by step

arsewards traces back through two separate lines of ancestry.

via English wards

StepLanguageWordMeaning
1Englishwardsplural of ward; Third-person singular simple...
2EnglishwardA warden; a guard; a guardian or watchman;...
3Middle Englishwardward, keeping
4Old Englishweardguard; guard, the action of looking out for...
5Old Englishōraore, unwrought metal
6Old Englishēarsea, ocean; grave, earth
7Proto-Germanicahazear
8Proto-Finnicahtasnarrow, cramped
9Proto-Balticanśtas
10Proto-Indo-Europeanh₂énǵʰusnarrow, tight
11Proto-Indo-Europeanh₂enǵʰ-to constrict, tighten, compress; narrow, tight;...

via English arse

StepLanguageWordMeaning
1EnglisharseThe buttocks or more specifically, the anus; A...
2Middle Englisharsarse, anus; bottom, buttocks; plural of art
3Old Frencharz
4Latinartessecond-person singular present active subjunctive...
5Latinarsart; skill, craft, handicraft, trade, power
6Proto-Italicartis
7Proto-Indo-Europeanh₂értisfitting
8Proto-Indo-Europeanh₂er-to fit, to fix, to put together
Every word from Proto-Indo-European h₂enǵʰ-Every word from Proto-Indo-European h₂énǵʰusEvery word from Proto-Baltic anśtas