Definition of chill pill noun from the Oxford Advanced Learner's Dictionary

 

chill pill

 noun
noun
BrE BrE//ˈtʃɪl pɪl//
 
; NAmE NAmE//ˈtʃɪl pɪl//
 
(informal)
 
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if you say that somebody should take a chill pill, you mean that they need to be calmer or to relax He’s always so stressed out—he really needs to take a chill pill!