1) Chain reaction metaphor 
The domino effect is a chain reaction that occurs when a small change causes a similar change nearby, which then causes another similar change, and so on in linear sequence. The term is best known as a mechanical effect, and is used as an analogy to a falling row of dominoes. It typically refers to a linked sequence of events where the time betwee...
noun 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)
the cumulative effect that results when one event precipitates a series of like events. Also called