harb- "change allegiance," L. orbus "bereft," Skt. arbhah "weak, child," Arm. orb "orphan," O.Ir. orbe "heir," O.C.S. rabu "slave," rabota "servitude" (cf.
robot), Goth. arbja, Ger. erbe, O.E. ierfa "heir," O.H.G. arabeit, Ger. Arbeit "work," O.Fris. arbed, O.E. earfoð "hardship, suffering, trouble"). The verb is attested from 1814. Orphanage "institute or home for orphans" is first attested 1865.