Where does “barring motor” come from?

barring motor (English) comes from English barring, from English bar, from French barre, from Middle French barre, from Old French barre, from Vulgar Latin barra, from Frankish bara, from Proto-Germanic barō — to pierce; to strike; brown.

Ancestry of “barring motor”, step by step

barring motor traces back through two separate lines of ancestry.

via English barring

StepLanguageWordMeaning
1Englishbarringpresent participle of bar; Bars; an arrangement...
2EnglishbarA solid, more or less rigid object of metal or...
3Frenchbarrebar, cake, ingot; Clipping of barre oblique: the...
4Middle Frenchbarrebar
5Old Frenchbarrebar
6Vulgar Latinbarrabarrier
7Frankishbarabar, beam, barrier, fence
8Proto-Germanicbarōbeam, bar, barrier
9Proto-Indo-EuropeanbʰerH-to pierce; to strike; brown

via English motor

StepLanguageWordMeaning
1EnglishmotorA machine or device that converts other energy...
2Middle Englishmotour
3Latinmotormover; that which moves something; first-person...
4Latin-tor-er
5Proto-Italic-tōrForms agent nouns to verb stems
6Proto-Indo-European-tōrDerives agent nouns from verbs, denoting someone...
7Proto-Indo-European-tor-s
Every word from Proto-Indo-European bʰerH-