n., pl., -keys.
- The domesticated ass (Equus asinus).
- Slang. An obstinate person.
- Slang. A stupid person.
[Perhaps from the name Duncan or of imitative origin.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.