doorknocker

/ˈdɔrˌnɑkər/
noun
  1. A metal or wooden object attached to a door that you hit against the door to announce your arrival.
    • The old house had a lion-shaped doorknocker that visitors would use.
    • Instead of a doorbell, they had a simple iron doorknocker.
    • She lifted the heavy brass doorknocker and let it fall three times.
Synonyms
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