guaranty

From Old French guarantie, from Old French guarantie (“protection, defense”), from Old French garantir, guarantir (“to warrant, vouch for something”), from Old French garant, guarant, warant (“a warrant; warranter, supporter, defender, protector”), from Frankish warand, warjand (“a warrant”), from Frankish warjan (“to fend for, designate something as true, vouch for”), from Proto-Germanic warjaną (“to defend, protect”), from Proto-Indo-European *wer- (“to close, cover, protect, save, defend”). Cognate with Middle Low German warent, warend (“a warrant”), German gewähren (“to grant”). More at warrant. Doublet of guarantee and warranty.