domino theory

noun

1. a theory that if one country is taken over by an expansionist, especially Communist, neighbor, party, or the like, the nearby nations will be taken over one after another.

domino theory

1. The idea that if one key nation in a region fell to control of communists, others would follow like toppling dominoes. The theory was used by many American leaders to justify American intervention in the Vietnam War. (See policy of containment.)

Word History and Origins

Origin of domino theory¹

First recorded in 1960–65

Example Sentences

According to the “domino theory,” countries around the world would fall to communism one-by-one — unless America stopped its spread.

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“A clear domino theory for the 21st century.”

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Finally, I stopped believing in the domino theory long ago.

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The Solomons are in jeopardy now, and while “domino theory” inevitability might not yet obtain, other island states are clearly vulnerable.

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“Eisenhower firmly believed in the domino theory. He visited Taiwan to show America’s resolve to defend Taiwan.”

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