KNOCKER

knocker. Knocker, n. one that knocks, a hammer of a door

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Knock″er (?), n. One who, or that which, knocks; specifically, an instrument, or kind of hammer, fastened to a door, to be used in seeking for admittance. Shut, shut the door, good John ! fatigued, I said; Tie up the knocker; say I'm sick, I'm dead. Pope.