GUARANTEES

Anything that assures a certain outcome.

"Can you give me a guarantee that he will be fit for the match?"

A legal assurance of something, e.g. a security for the fulfillment of an obligation.

More specifically, a written declaration that a certain product will be fit for a purpose and work correctly; a warranty

"The cooker comes with a five-year guarantee."

To give an assurance that something will be done right.

To assume or take responsibility for a debt or other obligation.

To make something certain.

"The long sunny days guarantee a good crop."