guarantee (n.)

1670s, "person that gives security," altered (perhaps via Spanish garante or confusion with legalese ending -ee), from earlier garrant "warrant that the title to a property is true" (early 15c.), from Old French garant "defender, protector; warranty; pledge; justifying evidence," from a Germanic source, from Proto-Germanic *war- "to warn, guard, protect," from PIE root *wer- (4) "to cover." For form evolution, see gu-. Sense of the "pledge" itself (which is properly a guaranty) developed 18c.

guarantee (v.)

1791, "to be surety for," from guarantee (n.). Garanten in this sense is from early 15c. Related: Guaranteed; guaranteeing.

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