The phrase "work off" refers to the act of getting rid of something through effort or activity. There are several synonyms for this phrase, and these include "burn off," "sweat off," "exercise off," "remove through effort," and "expel through physical exertion." All these phrases describe the action of getting rid of something through activity or some form of work. For instance, when one exercises, they can burn off fat or sweat off excess water. Similarly, one can work off their anger or frustration through physical exertion such as running or weight lifting. All in all, these synonyms depict the various ways people work off unwanted substances or emotions.