Definition of threepenny bit noun from the Oxford Advanced Learner's Dictionary

 

threepenny bit

 noun
noun
BrE BrE//ˌθrepəni ˈbɪt//
 
; NAmE NAmE//ˌθrepəni ˈbɪt//
 
(also threepenny piece)
 
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a British coin in use until 1971, worth three old pence