Meaning

noun a collateral agreement to answer for the debt of another in case that person defaults

originFrom 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…

Etymology from Wiktionary, CC BY-SA 3.0