pusher

/ˈpʊʃər/
noun
  1. A person who sells illegal drugs, especially on the street.
    • The police arrested a known pusher in the neighborhood.
    • The movie tells the story of a young pusher trying to escape the drug trade.
    • Parents warned their kids to stay away from the pusher near the park.
  2. A person who aggressively promotes or forces something on others, such as an idea or product.
    • She's a pusher for environmental causes, always encouraging people to recycle.
    • The salesman was a hard pusher, always trying to get you to buy more.
    • He's a real pusher of new technology at the office.
  3. A device or tool used to push something, such as a button or lever.
    • The drawer has a small pusher that helps close it softly.
    • Use the button pusher to activate the alarm from a distance.
    • The pusher on the machine makes it easy to start the conveyor belt.