American English

Definition of sidekick noun from the Oxford Advanced American Dictionary

 

sidekick

 noun
noun
NAmE//ˈsaɪdkɪk//
 
(informal)
 
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a person who helps another more important or more intelligent person Batman and his young sidekick Robin Sherlock Holmes and his trusted sidekick Dr. Watson
See the Oxford Advanced Learner's Dictionary entry: sidekick