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]
(..) is confused and harbors some sick ideas... ...but I am not ready to give up on him yet. His brother probably put him up to it. I can guarantee you percent his brother did not put him up to this. MURRAY: I find that hard to believe. Whatever. I know he was a good kid (..)1998 American History X