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

 

sidekick

 noun
noun
BrE BrE//ˈsaɪdkɪk//
 
; NAmE NAmE//ˈsaɪdkɪk//
 
(informal) Friends
 
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a person who helps another more important or more intelligent person Batman and his young sidekick Robin Inspector Morse and his trusted sidekick Sergeant Lewis The show is about a detective and his trusty sidekick. See related entries: Friends
See the Oxford Advanced American Dictionary entry: sidekick