Definition of Monopoly money noun from the Oxford Advanced Learner's Dictionary

 

Monopoly money

 noun
noun
BrE
 
; NAmE
 
[uncountable]
 
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money that does not really exist or has no real value Inflation was so high that the notes were like Monopoly money. Word Originfrom the imitation money used in the game of Monopoly (see monopoly in sense (3)).
See the Oxford Advanced American Dictionary entry: Monopoly money