guarantee
guarantee. . 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 ...
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