To disclaim connection with, responsibility for, etc.; to refuse to acknowledge; to disown; to abjure; to disavow.
To assert that something is not true.
To refuse to give or grant something to someone.
To disallow or reject.
To take something away from someone; to deprive of.
To prevent from scoring.
To assume or take responsibility for a debt or other obligation.
To make something certain.
To give an assurance that something will be done right.
The person to whom a guarantee is made.
A person who gives such a guarantee; a guarantor.
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
Anything that assures a certain outcome.