Sl. to calm down. Before we can debate this matter, you're all gonna have to chill out. So sit down and stop bickering.Everybody cooled out after the emergency, and everything was fine.
Calm down or relax, as in Don't let it bother you-just chill out, or Rex decided to come home and chill out for a while. [Slang; 1970s.] Also see cool it.