To swear falsely; be untrue to oaths or vows; bear false experience.
To render responsible of the criminal activity of testifying falsely under oath or solemn affirmation, particularly in judicial or formal procedures, or of being false to at least one's oaths or vows; forswear: widely used reflexively: because, the experience perjured himself.
To swear falsely to; deceive by untrue oaths or protestations.
Synonyms Perjure, Forswear. Perjure is technical and certain; purely, it's restricted to using a legal oath falsely; sometimes its useful for forswear. Forswear is basic, but somewhat antique.