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]
(..) Oh,wait. Leonard,I don't think I can do this. What,are you kidding? You're a semi-pro. No. We are committing genetic fraud. There's no guarantee that our sperm is going to generate high-iq offspring. Think about that. I have a sister with the same basic dna mix who hostesses at fuddruckers. (..)2007 TvShow: The Big Bang Theory Title: Pilot Season: 1 Episode 1