break open

Verb
  1. Open with force (synset 201349112)
    "He broke open the picnic basket"
  2. Come open suddenly and violently, as if from internal pressure (synset 200310092)
    "The bubble burst"
  3. Erupt or intensify suddenly (synset 200308567)
    "Unrest erupted in the country"; "Tempers flared at the meeting"; "The crowd irrupted into a burst of patriotism"

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