Definition of "knocker" []

• A hinged fixture, such as a metal ring or bar, used for knocking on a door. (noun)
• Vulgar Slang A woman's breasts. (noun)
• A goblin or dwarf said to live under the earth and direct miners to ore by knocking. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Startled, I look up, and see that the knocker is a man who looked a bit like this guy."
• "In England, one solution to this problem was to hire someone called a knocker-up."
• "How do we support the Navy Captain, a ring knocker from the Naval Academy, who was deep selected for his first star two years ahead of his classmates."