Meaning of “the domino theory” in the English Dictionary

american-english dictionary

(Definition of “the domino theory” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"domino theory" in American English

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domino theorynoun [ C usually sing ]

/ˈdɑm·ə·noʊ ˌθɪər·i, ˌθi·ə·ri/

politics & government a belief in the 1950s and 1960s that if one country became communist, other close countries would more easily also become Communist

(Definition of “domino theory” from the Cambridge Academic Content Dictionary © Cambridge University Press)