(someone's) snowball effect

Translations
эффект снежного кома (кого-то)
The small protest quickly turned into a massive rally, thanks to the snowball effect.
Небольшой протест быстро превратился в массовый митинг благодаря эффекту снежного кома.
Definitions
The phrase '(someone's) snowball effect' refers to a situation where a person's actions, decisions, or circumstances cause events to build up and grow in significance or impact over time, much like a snowball rolling down a hill gathers more snow and becomes larger. It highlights how small beginnings can lead to much larger consequences, often beyond the person's initial control.
Words
effect

noun
эффект
snowball

noun
снежок