the consequence of one event setting off a chain of similar events (like a falling domino causing a whole row of upended dominos to fall)
A situation in which one event causes a whole series of events to happen one after the other
chain reaction, cumulative effect resulting from one occurrence that directly causes a series of other events
If one event causes another similar event, which in turn causes another event, and so on, you can refer to this as a domino effect. The domino effect if one train is cancelled is enormous. A cumulative effect produced when one event sets off a chain of similar events: the domino effect of increasing the speed limit in one of several contiguous states