Perjury is a serious offense that involves lying under oath. When someone perjures themselves, it means they have given false testimony or sworn to something that is not true. There are several synonyms for the word "perjures oneself" that can be used in different contexts. These synonyms include giving false testimony, bearing false witness, telling a lie under oath, committing perjury, breaking an oath, and making a false statement. Each of these synonyms captures the essence of perjury in their unique way and can be used interchangeably depending on the situation. Whatever word is used, perjury remains a serious crime that undermines the integrity of the legal system and can have severe consequences.