the.com/guarantee
A promise wearing a suit, ready to pay damages if it lies.
means A formal assurance that something will happen or work, often backing it with money, repair, or replacement.
from From Old French garant, a defender or warrant, related to warranty — both circle the idea of someone standing behind their word.
Twin siblingGuaranty is the legal-finance spelling of the same idea.
Money-backPopularized in 1800s mail-order to soothe nervous buyers.
No promisesNothing in life is guaranteed except death and taxes.