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]
(..) I won't be much longer. Now, Sheila, you know what good work the church does in the community. I give you my personal guarantee that I'm going to take father out of the parish and this will never happen again. - We'll just be another moment, Paul. (..)2015 Spotlight