gamble - definition and synonyms

noun [singular] 

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/ˈɡæmb(ə)l/
  1. an action or plan that involves risks but will bring important benefits if it is successful

    His bankers opposed the move, but the gamble paid off (=was successful).

    take a gamble (on someone/something):

    They may be taking a gamble on a young player by paying him so much.