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]
(..) his father's empire. - Cobb, we should walk away from this. - Hold on. If I were to do this, if I even could do it... ... I would need a guarantee. - How do I know you can deliver? - You don't. But I can. So do you want to take a leap of faith... ...or become an old man, (..)2010 Inception
(..) is surrounding this place. Ten hours of flight time is a week at this level. That means each and every one of us will be killed. That I can guarantee you. We have no other choice but to continue on and do it as fast as possible. Downwards is the only way forwards. Get ready. (..)2010 Inception
(..) 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