marker - definition and synonyms

noun [countable] 

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  1. 1
    an object used for showing where something is or where you should go

    The leading horse fell at the three-furlong marker.

    a marker buoy/beacon

  2. 2
    a pen with a thick soft point made of fibres
  3. 3
    a player whose job is to stay close to a member of the other team in a game such as football in order to prevent them from getting the ball or playing effectively