perjure
verb (- perjure yourself
to tell a lie in court after you have sworn to tell the truth Topics Crime and punishmentc2作伪证;发假誓 Word Originlate Middle English (as perjured in the sense ‘guilty of perjury’): from Old French parjurer, from Latin perjurare ‘swear falsely’, from per- ‘to ill effect’ + jurare ‘swear’.