To Perjure

1. (reflexive) To knowingly and willfully make a false statement of witness while in court.
2. (transitive) To cause to violate an oath or a vow; to cause to make oath knowingly to what is untrue; to make guilty of perjury; to forswear; to corrupt.
3. (transitive) To make a false oath to; to deceive by oaths and protestations.

forswear, manswear