Definition of let out from the Oxford Advanced American Dictionary

 

let out

 
 
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Phrasal Verbs
(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.

    let something out

     
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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