Gamble is defined as to take a risk, or to play games especially with money for betting.(verb)
An example of gamble is to play the slots in Las Vegas.
The definition of a gamble is a risk.(noun)
An example of a gamble is the act of betting that a certain team will win a game.
See gamble in Webster's New World College Dictionary
Origin: prob. back-form. < obs. gamler, a gambler < gamel, to play (altered < ME gamen, to play < game, game) + -er: akin to Ger dial. gammeln, to sport, make merry
See gamble in American Heritage Dictionary 4
verb gam·bled, gam·bling, gam·bles verb, intransitive
Origin: Perhaps from obsolete gamel, to play games
Origin: , from Middle English gamen, gamenen, to play
Origin: , from Old English gamenian
Origin: , from gamen, fun.
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