Definition of gamble noun from the Oxford Advanced American Dictionary

  

gamble

 noun
noun
NAmE//ˈɡæmbl//
 
[singular]
 
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 an action that you take when you know there is a risk but when you hope that the result will be a success She knew she was taking a gamble but decided it was worth it. They invested money in the company right at the start and the gamble paid off (= brought them success). It was the biggest gamble of his political career.
See the Oxford Advanced Learner's Dictionary entry: gamble