snowball

SNOWBALL noun

[ C ] uk/ˈsnəʊbɔːl/ us
a ball made from snow that children throw at each other

снежок

snowball verb [ I ] uk/ˈsnəʊbɔːl/ us
If a problem, idea, or situation snowball s, it quickly grows bigger or more important.

расти как снежный ком
The whole business idea snowball ed from one phone call.