Definition of ringleader noun from the Oxford Advanced Learner's Dictionary

 

ringleader

 noun
noun
BrE BrE//ˈrɪŋliːdə(r)//
 
; NAmE NAmE//ˈrɪŋliːdər//
 
(disapproving) Criminals
 
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a person who leads others in crime or in causing trouble The ringleaders were jailed for 15 years. See related entries: Criminals
See the Oxford Advanced American Dictionary entry: ringleader