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Noun: sidekick  'sId,kik
Usage: informal
  1. An assistant or companion to another (often superior or more dominant) person
    "Batman's loyal sidekick was Robin"

Derived forms: sidekicks

See also: bud [N. Amer, informal], buddy [informal], chum [informal], cobber [Austral, informal], compadre, crony [informal], paisano [US], pal [informal]

Encyclopedia: Sidekick