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]
(..) Like tag it like a wild wildebeest, then you get $. - Dad, we're making the call. - I heard that. I've seen the commercial. They don't say that. That's not a guarantee. You think Greg would lie to me? Look, if that's a Transformer there from the Battle of Chicago, I need to know how it works. (..)2014 Transformers: Age of Extinction