To attest to (a fact) as the truth.
To attest that a product, service, organization, or person has met an official standard.
To authenticate or verify in writing.
To assert that something is not true.
To disclaim connection with, responsibility for, etc.; to refuse to acknowledge; to disown; to abjure; to disavow.
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.