The software comes with a 'money-back guarantee'. [=a promise that the money you spend on a product will be returned if the product is not good enough]
We used our house as a 'guarantee' for the loan. [=we said that the bank could take our house if we did not pay back the loan]
There is no 'guarantee' that they will approve the contract. [=there is no way to be sure that they will approve it]
(..) See you. Way to go, Spidey! Pizza time. You're late. I'm not paying for those. Joe's -minute guarantee is a promise, man. I know to you, Parker, a promise means nothing. But to me, i's serious. I's serious to me too, Mr. Aziz. You're fired. Go. (..)2004 Spider-Man 2
(..) Come on, minutes ago, in comes order. Harmattan, Burton & Smith. Eight extra-large deep-dish pizzas. In eight minutes, I am defauIting on Joe's -minute guarantee. Then, not only am I receiving no money for these pizzas... ...but I will lose the customer forever to Pizza Yurt. (..)2004 Spider-Man 2