break open

(verb) open with force. Synonyms: break open. Example: "He broke open the picnic basket."

(verb) come open suddenly and violently, as if from internal pressure. Synonyms: burst, split, break open. Example: "The bubble burst."

(verb) erupt or intensify suddenly. Synonyms: erupt, irrupt, flare up, flare, break open, burst out. Examples: "Unrest erupted in the country." "Tempers flared at the meeting." "The crowd irrupted into a burst of patriotism."