Work excessively can be defined as working beyond what is necessary or expected. The term is often used to describe someone who works too hard, often to the detriment of their own health and wellbeing. In this context, the crossword solution for the term work excessively is 'SLAVE', which refers to someone who is forced to work without pay or reward. This term is often used to describe people who are forced to work in oppressive conditions, with no control over their own lives.