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

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

From New York Times

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

From Washington Post

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

From Washington Post

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

From Washington Post

What about the influence of the domino theory, a key Cold War doctrine, on his decision-making?

From Washington Post