IPA: /ˈdɒkə/
KK: /ˈdɑkər/
A person who works at a dock, loading and unloading ships, or someone who is involved in the process of docking something.
The docker skillfully loaded the cargo onto the ship.
The word 'docker' originates from the term 'dock' (from Old English *docce*, meaning a place for ships) combined with the agent suffix '-er' (meaning a person who). A docker is a person who works at a dock, typically loading and unloading cargo from ships.
Think of someone working at a 'dock' — the '-er' indicates a person, so a docker is simply a person who works at the dock.