Similar word to out-break:

advance, aggression, assailing, assailment, barrage, blitz, blitzkrieg, charge, defilement, dirty deed, drive, encounter, encroachment, foray, incursion, initiative, inroad, intervention, intrusion, invasion, irruption, mugging, offense, offensive, onrush, onset, onslaught, outbreak, push, raid, rape, rush, skirmish, storming, strike, thrust, violation, volley


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