D defs.my
Entry 3 senses Webster, 1913

outbreak

/out'-brākˌ/ · out·break · IPA /ˈaʊtbɹeɪk/
01 n. A bursting forth; eruption; insurrection; mutiny; revolt.
  1. 1.
    A bursting forth; eruption; insurrection; mutiny; revolt.
    “The flash and outbreak of a fiery mind.” Shak.
  2. 2.
    A sudden beginning of a violent event; as, the outbreak of hostilities between ethnic groups.
  3. 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.