Swear off is a phrase used to indicate that someone has decided to give up or stop doing something. There are many synonyms for this phrase, each with its own connotations. One option is to say that someone has chosen to abstain from a particular activity or behavior. Another possibility is to say that they have committed to renouncing something. Some may use the term to "quit" or "cease" a habit or behavior, while others may declare that they are "done with" or "washed their hands of" a particular situation or activity. Whatever phrase one chooses, the implication is that the person is dedicated to making a change and sticking to it.