Source : WordNet®

break open
     v 1: open with force; "He broke open the the picnic basket"
     2: break open or apart suddenly; "The bubble burst" [syn: {burst},
         {split}]
     3: erupt or intensify suddenly; "Unrest erupted in the
        country"; "Tempers flared at the meeting"; "The crowd
        irrupted into a burst of patriotism" [syn: {erupt}, {irrupt},
         {flare up}, {flare}, {burst out}]