The meaning of the idiom “break out” is:

by

(A) break down
(B) Collapse
(C) Incomplete
(D) Occur suddenly 

🧠 Explanation:

  • The idiom “break out” means to occur suddenly, often referring to events like wars, fires, or epidemics.
  • It implies a sudden start or eruption of something unexpected.
  • It does not mean to break down, collapse, or be incomplete.
  • Common usage includes phrases like “a fire broke out” or “a conflict broke out.”