From Middle English tharf (infinitive thurven; also thar, dar by confusion with forms of dare), from Old English þearf, first and third person singular indicative of þurfan (“to be in need, have need of, need to, be required to, be obliged to, owe”), from Proto-Germanic *þurfaną, *þurbaną, *þerbaną (“may, need to, be allowed to”), from Proto-Indo-European *terp-, *trep- (“to saturate, enjoy”). Cognate with Dutch durf (“(I) dare”) (infinitive durven), German darf (“(I) am allowed to”) (infinitive dürfen), Swedish tarva (“to require”), Icelandic þarf (“(I) need”) (infinitive þurfa).
From Middle English therf, from Old English þeorf (“unleavened, fresh, skim”), from Proto-Germanic *þerbaz (“unleavened, simple”), from Proto-Indo-European *(s)terbh-, *(s)trebh- (“rigid, stiff, tight”). Cognate with Old Frisian therve, Middle Dutch derf, Middle High German derp, Icelandic þjarfur (“unleavened”).
tharf f (genitive tharvo)