n. 1. A bursting forth; eruption; insurrection; mutiny; revolt. “Mobs and outbreaks.” J. H. Newman. [ 1913 Webster ]
The flash and outbreak of a fiery mind. Shak. [ 1913 Webster ]
2. A sudden beginning of a violent event; as, the outbreak of hostilities between ethnic groups. [ PJC ]
3. A sudden occurrence or manifestation; -- usually of disease or emotion, in one person or a group; as, an outbreak of measles among the students; he had an outbreak of shingles; an outbreak of nervousness in the mob. [ PJC ]