American English

Definition of flatten out phrasal verb from the Oxford Advanced American Dictionary

 

flatten out

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    flatten out

     
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  1. 1to gradually become completely flat The hills first rose steeply then flattened out toward the water.
  2. 2to stop growing or going up Export growth has started to flatten out.

flatten somethingout

 
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to make something completely flat
See the Oxford Advanced Learner's Dictionary entry: flatten out