A guarantee is a promise that something will work or happen as stated, or that you will get your money back or a replacement if it does not. It gives people confidence that they are protected if things go wrong.
From French “garantie,” related to “garant” (warrantor), from Old French “garir,” “to protect, defend.” It is closely related to “warranty,” which came into English through a different French form.
Guarantee and warranty are linguistic cousins—two paths from the same French root about protection. A guarantee is like a safety net wrapped in a promise: if this fails, you won’t fall alone.
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