Definition of snowball noun from the Oxford Advanced American Dictionary

     

    snowball

     noun
    noun
    NAmE//ˈsnoʊbɔl//
     
     
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  1. 1[countable] a ball that you make out of snow to throw at someone or something in a game a snowball fight Children were throwing snowballs at the passing traffic.
  2. 2[singular] (often used as an adjective) a situation that develops more and more quickly as it continues All this publicity has had a snowball effect on the sales of their latest album.
  3. 3[countable] a cocktail (= a type of alcoholic drink) that contains advocaat and lemonade
  4. Idioms
    not have a snowball's chance in hell(informal)
     
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    to have no chance at all
See the Oxford Advanced Learner's Dictionary entry: snowball