noun
a metal ring, hinged on a striking plate, that is attached to a door by a striking plate and is rapped against a door to announce one's presence
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She gently tapped the knocker on the door to announce her presence.
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He banged on the knocker impatiently, wanting to be let in.
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I used the knocker to let my friends know I was outside.
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His words were like a heavy knocker on her heart, leaving her feeling sad and defeated.