noun:the color between green and violet in the spectrum; the color of the clear sky or the deep sea
He’s the man with the blue hat.
adjective:feeling or showing sadness, melancholy, or depression
He felt a little blue after hearing the disappointing news.
noun:a genre of music characterized by its use of specific chord progressions and expressive, often sorrowful lyrics
He spent the evening listening to classic blues records from the 1960s.
