sidekick

[ sahyd-kik ]
/ ˈsaɪdˌkɪk /

noun

a close friend.
a confederate or assistant.

Origin of sidekick

An Americanism dating back to 1900–05; side1 + kick
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for sidekick

sidekick

/ (ˈsaɪdˌkɪk) /

noun

informal a close friend or follower who accompanies another on adventures, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012