Domino Theory Definition
noun
The theory that a certain result (domino effect) will follow a certain cause like a row of upright dominoes falling if the first is pushed; specif., the theory that if a nation becomes a Communist state, the nations nearby will also.
Webster's New World
A theory that one event will set off a train of similar events, especially:
American Heritage
Origin of Domino Theory
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An allusion to a row of dominoes in which the fall of one leads to a cascade of falling pieces.
From Wiktionary
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