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]
(..) These pods can trigger anything from bombs to traps to mutts. We cannot move without this device. There's no guarantee that our database is complete. There could be new pods that we're not aware of. Because we don't want the Gamemakers to know (..)2015 The Hunger Games: Mockingjay - Part 2
(..) to intimidate their forces. And inspire surrenders. Even though we'll be working on abandoned streets miles behind the front lines, I guarantee you, wherever they put us, it will not be safe. This is a war zone. It is likely that we'll encounter both active pods (..)2015 The Hunger Games: Mockingjay - Part 2