Definition of throw open phrasal verb from the Oxford Advanced Learner's Dictionary

 

throw open

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    throw somethingopen (to somebody)

     
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  1. 1to allow people to enter or visit a place where they could not go before
  2. 2to allow people to discuss something, take part in a competition, etc. The debate will be thrown open to the audience. The organizers are throwing the contest open to under 21s for the first time.
See the Oxford Advanced American Dictionary entry: throw open