noun
knocker
NOK-uh
noun
1
A hinged fitting attached to a door, used to make a rapping sound to announce a visitor.
"The brass knocker on the front door was shaped like a lion's head."
2
Someone who habitually criticizes or disparages something.
"He's just a knocker who has nothing good to say about anyone."
How to Use Knocker
Learner’s notesIn plain EnglishA device on a door for announcing visitors, or a person who is always finding fault.
Common pairings
a door knocker
brass knocker
Word Forms
knockers plural
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The brass _____ on the front door was shaped like a lion's head.
Etymology
From knock plus the agent-forming ending -er.