Longman Dictionary of Contemporary English homepage

snowball

1 noun
     
NEW! See related topics: OTHER GAMES
snow‧ball1 [countable]
1DGO a ball of snow that children make and throw at each other:
We had a massive snowball fight.
2

snowball effect

if something has a snowball effect, it starts a series of events or changes that all happen because of each other
3

not have a snowball's chance in hell

informal to have no chance at all
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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