Dictionary

domino theory

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 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
First Known Use: 1965

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