The phrase "adds fuel" commonly refers to intensifying a situation or making it worse. Some synonyms for this phrase include aggravate, amplify, increase, escalate, kindle, provoke, stoke, and enhance. These words can be used interchangeably with "adds fuel" to emphasize the act of making a situation more intense or volatile. It is important to be mindful of how and when these words are used since they can have strong connotations and affect the tone of communication. Using synonyms like these can help to accurately convey the intended emotion or emphasis and make the message more impactful.