Where does “ar-” come from?

ar- (Old English) comes from Proto-West Germanic uʀ-, from Proto-Germanic uz-, from Proto-Indo-European uss-, from Proto-Indo-European uds-, from Proto-Indo-European úd — out, outward.

Ancestry of “ar-”, step by step

StepLanguageWordMeaning
1Proto-West Germanicuʀ-out, over; off, away
2Proto-Germanicuz-up, out
3Proto-Indo-Europeanuss-—
4Proto-Indo-Europeanuds-up, out
5Proto-Indo-Europeanúdout, outward

Words derived from “ar-”

Every word from Proto-Indo-European úd →Every word from Proto-Indo-European uds- →Every word from Proto-Indo-European uss- →