Etymology
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sidekick (n.)

also side-kick, "companion or close associate," 1901, also side-kicker (1903), American English, of unknown origin. Earlier terms were side-pal (1886), side-partner (1886).

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Definitions of sidekick

sidekick (n.)
a close friend who accompanies his buddies in their activities;
Synonyms: buddy / brother / chum / crony / pal
From wordnet.princeton.edu