English Reference
noun

sidekick

n.
US /ˈsaɪdˌkɪk/ UK /sˈaɪdkɪk/ side·kick UK spelling sidekicks

  1. 01 B2 Upper Intermediate Informal

    a person who helps a more important person, often going everywhere with them.

    a subordinate partner or assistant who accompanies a superior or more prominent individual.

    Simple

    The detective and his loyal sidekick arrived at the crime scene together.

    In context

    Throughout the campaign, the candidate was rarely seen without his trusted sidekick, who managed the press and handled minor crises.

    Usage

    Usually refers to a person in a supporting role rather than an equal partner.

    Teacher's tip

    While common in fiction, using this for a real colleague can sound slightly belittling as it implies they are less important.

  2. 02 B2 Upper Intermediate Theatre

    a character in a book or movie who helps the main hero and makes them look better.

    a character in a narrative who serves as a foil to the protagonist, highlighting their traits through contrast or support.

    Simple

    Robin is the most famous sidekick in comic book history.

    In context

    The author used the protagonist's sidekick to provide comic relief and to ask the questions the audience might be thinking.

But as his best friends pursue their own ideas and the new kid starts to turn into a villain rather than a sidekick, will Hari’s dream be over before it’s begun?

The Guardian· 27 Feb 2026

From side + kick, which in the late 19th and early 20th century was a slang term for the front side pocket of a pair of trousers, known as the pocket safest from theft. Thus, by analogy, a "side-kick" was a person's closest companion.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated