1. mod. depressed; melancholy. That music always makes me blue.
2. mod. obscene; vulgar; dirty. Those blue jokes don’t go over very well around here.
3. n. the sky; the heavens. The idea came to me right out of the blue.
4. mod. alcohol intoxicated. You might say I’m blue. Others might note that I am stoned.
5. n. an amphetamine tablet or capsule, especially a blue one. (Drugs.) How are blues different from reds and yellows?
6. n. a police officer; the police. The blues will be here in a minute.
7. n. a 10-mg tablet of Valium. (Drugs.) In treatment they kept giving me blues to calm me down. Now I can’t live without them.