O.E. hindrian "to harm, injure, impair," from P.Gmc. *khinderojanan, from a root meaning "on that side of, behind" (cf. hind (adj.)); thus the ground sense is "to put or keep back." Cognate of O.N. hindra, Du. hinderen, Ger. hindern "to keep back."
"rear," O.E. hinder (adv.), possibly comparative of hind (adj.).