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one-armed bandit

noun [C]
 
/ˌwʌn.ɑːmdˈbæn.dɪt/ US  /-ɑːrmd-/ UK informal

Definition

a type of slot machine with a large metal pole on the side that you pull to make it workGambling and bookmakingTaking risks
(Definition of one-armed bandit noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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