Definition of Tammany Hall noun from the Oxford Advanced American Dictionary

 

Tammany Hall

 noun
noun
NAmE//ˌtæməni ˈhɔl//
 
 
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a dishonest political organization that had a lot of influence in New York City in the 19th and early 20th centuries (sometimes used to refer to any dishonest political organization) She turned the club's financial committee into Tammany Hall.
See the Oxford Advanced Learner's Dictionary entry: Tammany Hall