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]
(..) You're going to need it. For what? Your training. Morning. Did you sleep? You will tonight. I guarantee it. I'm Tank. I'll be your operator. - You don't have any -- - Holes? Nope. Me and my brother, Dozer, are % pure, old-fashioned, homegrown human. (..)1999 The Matrix