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]
(..) than you'd get down there but I'm prepared to give you a $ bonus on your lot. What kind of royalty are you talking about? One-sixth, plus a guarantee to start drilling within days. Now, that's something you won't find anywhere else. What age are your children, ma'am? Ten and twelve. (..)2007 There Will Be Blood
(..) I have business connections, so I can get the lumber for the derricks. Such things go by friendship in a rush like this. And this is why I can guarantee to start drilling and to put up the cash to back my word. I assure you, ladies and gentlemen, no matter what the others promise to do, (..)2007 There Will Be Blood