coldcock
American Heritage Dictionary:
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cold·cock
(kōld'kŏk') 
tr.v. Slang, -cocked, -cock·ing, -cocks.
To knock (another) unconscious.
tr.v. Slang, -cocked, -cock·ing, -cocks.
To knock (another) unconscious.
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American Heritage Dictionary
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.
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