Also,
feel blue. Feel depressed or sad, as in
After seeing the old house in such bad shape, I had the blues for weeks, or
Patricia tends to feel blue around the holidays. The noun
blues, meaning "low spirits," was first recorded in 1741 and may come from
blue devil, a 17th-century term for a baleful demon, or from the adjective
blue meaning "sad," a usage first recorded in Chaucer's
Complaint of Mars (c. 1385). The idiom may have been reinforced by the notion that anxiety produces a livid skin color. Also see
blue funk.