'sidekick' originates from American English, specifically the word 'side' meaning 'next to' and 'kick' meaning 'a person or thing that is kicked or pushed.'

'sidekick' evolved from the combination of 'side' and 'kick' in the late 19th century, becoming a colloquial term for a close companion.

Initially, it referred to someone who was literally at one's side, but over time it evolved into its current meaning of a close companion or assistant.