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1.
1. A very attractive woman. So named because her attractiveness is so stunning that it can (figuratively) knock you out. (make you speechless, stutter, etc.) Hence the term "knockout."
2. A punch in boxing that knocks your opponent unconscious, typically ending the match.
Guy1: Wow check her out!
Guy2: Yep, she's a knockout all right.

by GMG1 January 02, 2008
356 117
 
2.
to go to sleep. mainly said in reference to a full nights rest, 7 or more hours.
hey man, i'm about to knock out. laters.
by noooooooooope June 07, 2009
145 33
 
3.
(Informal Noun) a person or thing that is overwhelmingly attractive.
Svetlana knew how to dress to perfectly complement her tall, athletic frame. By virtue of her bright eyes, silky long hair, and a smile that could stop a revolution, people widely regard her as a knock out.
by JigHexadecimal August 26, 2007
130 43
 
4.
This is a girl who is beautiful with or without makeup. Most are high matinence but doesn't mean all of them will be. She has it all, beauty and brains.

Also know as: Knockout Beauty.
I like dat chick right there! She's a knockout.
by Mon-Mon August 13, 2007
103 46
 
5.
a basketball game where one person shoots a free throw/three pointer and if he misses he must chase his ball and make any shot before the person behind him makes a shot.
I can't shoot so he beat me in knockout.
by ben renner June 22, 2005
50 44
 
6.
To go to sleep.
I'm so tired so I'm gonna knock out!
by Blabbermouth June 23, 2014
1 0
 
7.
A Mike Tyson
A: There's a swelling under your eye. Did you fight last night?
B: Yes
A: Did you win?
B: I Tysoned him out

knockout
by gachello August 05, 2011
20 20