Where does “inerring” come from?

inerring (English) comes from English erring, from English err, from Middle English erren, from Old French errer, from Latin errantem, from Latin errō, from Proto-Italic erzāō, from Proto-Indo-European h₁ers- — to flow.

Ancestry of “inerring”, step by step

inerring traces back through two separate lines of ancestry.

via English erring

StepLanguageWordMeaning
1Englisherringpresent participle of err; The act of one who...
2EnglisherrTo make a mistake; To sin; to stray
3Middle Englisherren
4Old Frencherrerto walk (to); to wander (to)
5Latinerrantemaccusative masculine singular of errāns;...
6Latinerrōto wander, rove, stray, roam
7Proto-Italicerzāōroam, wander; go astray, waver
8Proto-Indo-Europeanh₁ers-to flow

via English in

StepLanguageWordMeaning
1EnglishinUsed to indicate location, inclusion, or position...
2Middle EnglishinAny kind of accomodation; particularly; A home or...
3Old Englishinin; Alternative form of inn
4Proto-West Germanic*in
Every word from Proto-Indo-European h₁ers-Every word from Proto-Italic erzāōEvery word from Latin errō