domino effect

the cumulative effect that results when one event precipitates a series of like events.
Also called domino reaction.

1965–70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
domino effect
a series of similar or related events occurring as a direct and inevitable result of one initial event
[C20: alluding to a row of dominoes, each standing on end, all of which fall when one is pushed: originally used with reference to possible Communist takeovers of countries in SE Asia]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
And this project could create a domino effect that will open up other
  fourteeners in the state.
Every once in a while, one hippo will decide to move, and this causes a domino
  effect through the whole group.
Its basically a domino effect within the fad dominated world of teens.
The spill will have a domino effect across the country.
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