What Does Feeling Blue Mean?
Many cultures relate various colors to different moods, or assign other symbolic meaning to them. For example, in many English speaking cultures, red can signify anger, black can mean death or evil, white can show purity, and green can represent jealousy or a talent for growing plants.
The use of the color blue to mean sadness goes all the way back to the 1300s. Some sources point to Geoffrey Chaucer as the first author to write the word blue.
He wrote Wyth teres blewe and with a wounded herte in his poem Complaint of Mars from around the year 1385. Nowadays, we would write with tears of blue and a wounded heart. This could mean from its very first appearance, blue was connected with sadness.
A scientific study also showed that people with depression might perceive the color blue more than other colors. Therefore, there may be a scientific reason behind this metaphor.
The idiom feel blue means to experience emotions of sadness or gloominess.