Archaic or rare: intransitive, meaning 'to break out suddenly'.
Definitionen
(Archaic) To break out or burst forth suddenly. Around midnight the storm outbroke with terrifying force.
Synonyme
crop up
spring up
break forth
flare up
burst forth
break out
Used attributively before another noun to denote relation to an outbreak, e.g., 'outbreak investigation'.
Definitionen
Relating to or intended for dealing with an outbreak. The hospital set up an outbreak response unit.