Definition of break through phrasal verb from the Oxford Advanced Learner's Dictionary

 

break through

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to make new and important discoveries Scientists think they are beginning to break through in the fight against cancer. related noun breakthrough

    break through

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    break through something

     
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  1. 1to make a way through something using force Demonstrators broke through the police cordon. There was a police cordon around the site but the demonstrators still broke through.
  2. 2(of the sun or moon) to appear from behind clouds The sun broke through at last in the afternoon. At last the moon broke through the clouds and they could see their way.

break through something

 
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to succeed in dealing with an attitude that somebody has and the difficulties it creates synonym overcome He had finally managed to break through her reserve.
See the Oxford Advanced American Dictionary entry: break through