Middle English tharf

← Old English þearf (inherited)

← Old English þurfan (mention)

← German darf (cognate)

← German dürfen (mention)

← Proto-Germanic *þurfaną (derived)

← Proto-Germanic *þurbaną (mention)

← Proto-Germanic *þerbaną (mention)

← Proto-Indo-European *terp- (derived)

← Proto-Indo-European *trep- (mention)

← Icelandic þarf (cognate)

← Icelandic þurfa (mention)

← Dutch durf (cognate)

← Dutch durven (mention)

← Swedish tarva (cognate)

→ English thair (mention)