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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. chime in 1.Join in harmoniously or in unison, either literally (with music) or figuratively (joining a conversation to express agreement). For example, In this passage I want the altos to chime in with the tenors, or When Mary agreed, her sister chimed in that she'd join her. The literal usage was first recorded in 1681, the figurative in 1838. 2. chime in with. Be in agreement or compatible with, as in His views chime in with the paper's editorial stance. [Early 1700s]
American Heritage Idioms
2
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Phrase(s): chill out [and] 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.
McGrawhill's American Idioms And Phrasal Verbs