blue monday

Blue Monday is a cliche often used to describe how unpleasant Mondays are for people who are in school or who work Monday to Fridays. Monday is often seen as being sad and depressing, otherwise blue, since it is the end of the weekend and the beginning of the workweek or school week. People often refer to Mondays as blue Mondays as a way to describe how unpleasant Mondays are for them.