People who bet money on games, sports, or uncertain outcomes, hoping to win more money.
From 'gamble,' which comes from Middle English 'gamenen' meaning to play games. It evolved to specifically mean playing games of chance with money at stake.
Interestingly, 'gamble' and 'game' share the same root, but gamblers play a very different kind of game—one where psychology and probability matter more than rules and skill.
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