The phrase "sweat slave" refers to a person who is exploited and made to work hard under difficult situations. However, there are many synonyms that can be used in place of this derogatory term. Some alternative expressions for "sweat slave" include "forced laborer," "indentured servant," "bonded worker," or "unpaid laborer." Other appropriate words that could be utilized to describe this type of labor include "exploited employee," "overworked staff," or simply "unfairly treated worker." It is important to use respectful language when discussing an individual's work situation, and to recognize and address any instances of exploitation or mistreatment in the workplace.