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An allusion to a row of dominoes in which the fall of one leads to a cascade of falling pieces.
- The situation in which one event sets off a chain of additional events.
- (politics, historical) The theory that, if South Vietnam fell to Communism, it would be followed by Cambodia, Laos, additional Southeast Asian countries, other Asian countries, and likely even elsewhere.
- Synonym: domino theory
chain of events
theory of encroaching communism