drumbeater

/ˈdrʌm ˌbiːtər/
noun
  1. A person who plays a drum, especially in a band or parade.
    • She became a skilled drumbeater after years of practice.
    • The drumbeater led the procession with a lively rhythm.
    • Every drumbeater in the competition had to perform a solo.
  2. A person who strongly and repeatedly promotes a cause, idea, or product.
    • The company hired a famous athlete as a drumbeater for their new sneakers.
    • She acted as a drumbeater for the charity, speaking at every event she could.
    • He was a tireless drumbeater for environmental protection.