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1. To become calmer. Don't talk to your mother like that! Go to your room and cool out! I'm sorry for my outburst—I just need some time to cool out.
2. To cause someone to become calmer. In this usage, a noun or pronoun can be used between "cool" and "out." If you insist on talking to your mother that way, I think a punishment is the only thing that will cool you out. That break seemed to cool him out—he's no longer yelling at the staff.
slang Calm and composed. Because Alice loves performing, she's always cooled out before taking the stage.
Sl. calm; unabashed. Ted is a really cooled out kind of guy. When she's cooled out, she's great.
mod. calm; unabashed. Ted is a really cooled out kind of guy.