A snowball effect describes accelerating growth: as the process continues, its size or importance increases faster and faster. It is related to cascading consequences, but its defining image is compounding growth rather than simply one event causing the next.
ReviewedEvidence1 sourceSectionPhrases & Idioms
Quick answer
A “snowball effect” is a process in which something grows in size or importance at an increasingly rapid rate.
Key details
Confusion Familyphrase meaning and usage
Current Meaninga situation in which something increases in size or importance at a faster and faster rate
Registergeneral English
Further guidance
History Boundary
Current dictionary-supported meaning is published without claiming an exact inventor, coinage date or absolute first use.
Meaning
a situation in which something increases in size or importance at a faster and faster rate
Usage Boundary
Use it when the emphasis is compounding or accelerating growth, not merely any sequence of consequences.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
The butterfly effect describes disproportionate downstream consequences from a small change. Cambridge connects the phrase with chaos theory; in general use, keep the emphasis on a small initial change producing a much larger outcome rather than on ordinary direct causation.
A “domino effect” describes a situation in which one event causes a series of related events to happen one after another. Use it when the emphasis is on sequential consequences spreading from an initial event, not simply on two events happening at the same time.
A “knock-on effect” describes an indirect consequence in which one event or situation causes further events or situations. Use it for secondary or indirect consequences rather than the first direct effect itself.
“At stake” means that something valuable is in danger of being lost. The guide stays with current documented meaning and does not add unsupported origin chronology.
A “black swan” is an event that happens despite people having thought it could not happen. Use the figurative sense for a supposedly impossible or profoundly unexpected event; keep it distinct from the literal black swan bird, and do not treat every ordinary surprise as a black swan.
Oxford defines “a canary in a/the coal mine” as something that gives an early warning of danger. This guide uses that current figurative meaning without claiming an unsupported exact first use.
A “chain reaction” describes a series of events in which each event causes the next one. In figurative use, focus on the causal sequence; the expression also has a literal scientific sense, so context determines which reading applies.
