Definition of domino effect noun from the Oxford Advanced Learner's Dictionary

 

domino effect

 noun
noun
BrE
 
; NAmE
 
[usually singular]
 
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a situation in which one event causes a series of similar events to happen one after the other Employers fear a domino effect if the strike is successful (= that there will be many other strikes as a result).
See the Oxford Advanced American Dictionary entry: domino effect