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Related to chill out: Chill out music
1. slang To become calmer; to calm down. This phrase is often used as an imperative. Just chill out—panicking about being late won't make me drive any faster. Wow, she has really chilled out in retirement—remember how animated she used to be in the courtroom?
2. slang To relax. We're just chilling out and watching some TV, if you want to join us.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
chill outand cool out
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
To relax: We hung out by the pool and chilled out all day long.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in. to calm down; to be cool; to get cool; to relax. Before we can debate this matter, you’re all gonna have to chill out.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
Take it easy, calm down. This slangy imperative is relatively new, dating only from about 1980, but has caught on enough to approach cliché status. It alludes to being “cool,” that is, clever and laid back. See also lighten up.
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer