The term 'swear off' can be defined as to make a solemn promise to abstain from something. The crossword solutions for this term are FORSWEAR (8 letters), FORGO (5 letters), and RENOUNCE (8 letters). FORSWEAR means to make a solemn promise or vow to abstain from something, while FORGO means to abstain from or give up something, and RENOUNCE means to reject or disown something. All three words are related to the idea of swearing off something, and all involve making a commitment to abstain from something.