Comprehensive resource for understanding and mastering English idioms
The idiom "snowball effect" refers to a chain reaction of events that have a significant impact on an initial situation. The figurative meaning is the rapid growth or expansion of something, often starting with a small action or event.
The idiom "snowball effect" has been in use since at least the 1920s. It was first used in the context of the stock market, where small gains or losses could lead to a chain reaction of events. The term "snowball effect" comes from the idea that a snowball grows larger as it rolls downhill, picking up more and more snow along the way. Over time, the idiom has been used in a variety of contexts to describe rapid growth or expansion.