The crossword solution for the term SIGN OF HARD WORK is 'SWEAT'. SWEAT is a natural bodily secretion that is produced when the body is under physical or emotional stress. It is composed of water, salt, and other electrolytes, and is released through the pores in the skin. Sweating is an important part of the body's cooling system, and it helps to regulate body temperature. Sweating is also a sign of hard work, as it is often associated with physical exertion.