"Forswear oneself" is a phrase that means to break a promise, oath, or vow. There are many synonyms for this term, including perjure oneself, break one's word, renege, go back on one's word, betray, deceive, lie, and be unfaithful. Each of these synonyms implies a willful act of breaking a pledge or promise and can have negative consequences. It is important to keep one's promises and maintain one's integrity in personal and professional relationships. If you find yourself in a situation where you cannot keep your word, it is better to communicate this honestly than to break your commitment and "forswear oneself."".