Definition of let out from the Oxford Advanced American Dictionary

 

let out

 
 
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Phrasal Verbs

ˌlet ˈout

 
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(of school classes, movies, meetings, etc.) to come to an end, so that it is time for people to leave The movie has just let out.

    ˌlet something ˈout

     
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  1. 1to give a cry, etc. to let out a scream of terror to let out a gasp of delight opposite hold in
  2. 2to make a shirt, coat, etc. looser or larger opposite take in