domino theory

noun

Definition of domino theory

1 :a theory that if one nation becomes Communist-controlled the neighboring nations will also become Communist-controlled
2 :the theory that if one act or event is allowed to take place a series of similar acts or events will follow

Origin and Etymology of domino theory

from the fact that if dominoes are stood on end one slightly behind the other, a slight push on the first will topple the others


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