open up

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open up (third-person singular simple present opens up, present participle opening up, simple past and past participle opened up)

  1. (intransitive, transitive) To open.
    Some vacancies have opened up due to retirements.
    Open up the door!
    • 2011 February 1, Phil McNulty, “Arsenal 2 - 1 Everton”, in BBC[1]:
      Wilshere then opened up Everton's defence, but Van Persie lifted his finish over the onrushing Howard and also over the bar.
  2. (intransitive) To reveal oneself; to become communicative.
    After three hours of questioning, he finally opened up.
  3. (intransitive) To commence firing weapons.
    As the convoy entered the pass, we opened up on them with everything we had.