from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A series of short sharp sounds, as that made by knocking on a door.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A series of short, sharp taps, especially made by knocking on a door, beating a drum, or firing an automatic weapon
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a series of short sharp taps (as made by strokes on a drum or knocks on a door)
Imitative.(American Heritage® Dictionary of the English Language, Fourth Edition)