outbreak /ˈaʊtbɹeɪk/noun 4verb 1forms 5 noun4 •An eruption; the sudden appearance of a rash, disease, etc.Any epidemic outbreak causes understandable panic. •A sudden increase.There has been an outbreak of vandalism at the school. •(figurative) An outburst or sudden eruption, especially of violence and mischief.There has been an outbreak of broken windows in the street. •Synonym of breakout (“escape from prison”). verb1 •To burst out or break forth. formsoutbroke · outbroken · outbreaking · outbreaketh · outbreaks