'break open' definitions:

Open with force; "He broke open the picnic basket"

Come open suddenly and violently, as if from internal pressure; "The bubble burst" [syn: burst, split, break open]

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, break open, burst out]