break out

start abruptly; "After 1989, peace broke out in the former East Bloc"

begin suddenly and sometimes violently; "He broke out shouting"

move away or escape suddenly; "The horses broke from the stable"; "Three inmates broke jail"; "Nobody can break out--this prison is high security"

take from stowage in preparation for use

become raw or open; "He broke out in hives"; "My skin breaks out when I eat strawberries"; "Such boils tend to recrudesce"