The term 'worked up a sweat' can be described by two crossword solutions: perspired (9 letters) and TOILED (6 letters). Perspiring is the process of releasing sweat from the body, usually as a result of physical activity or heat. Toiling is the act of working hard, often for long periods of time, in order to achieve a goal. Together, these two words describe the phrase 'worked up a sweat, ' which is used to describe the physical exertion that comes with hard work.