1. a hinged device on a door used for knocking to announce one’s presence
2. a person who knocks on something
3. a person who criticizes or finds fault
Usage: informal

Examples

• The brass knocker on the front door was polished to a bright shine.
• She lifted the heavy iron knocker and rapped three times.
• The knocker at the door turned out to be a delivery person.
• He was known as a knocker who always found something wrong with every proposal.
• Don’t be such a knocker – try to see the positive side of things.
• The antique door knocker was shaped like a lion’s head.
• Every knocker who came to the house had to use the side entrance.