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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.
von JigHexadecimal 26. August 2007
 
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.

von GMG1 2. Januar 2008
 
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.
von noooooooooope 7. Juni 2009
 
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.
von Mon-Mon 13. August 2007
 
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.
von ben renner 22. Juni 2005
 
6.
To go to sleep.
I'm so tired so I'm gonna knock out!
von Blabbermouth 23. Juni 2014
 
7.
Knockouts and Knockouts Haircuts for Men are the trade names of an American salon chain with a boxing (and mixed martial arts) /sex appeal theme targeting men. NBC's "The Today Show" and CNBC's "The Big Idea with Donny Deutsch" and other media have labeled Knockouts the Hooters of Haircutting. Knockouts employs an attractive all-female staff of licensed hair stylists and massage therapists. The services include haircuts, hair coloring, waxing, manicures, pedicures, and six types of massage therapy.
Dude, if you want a cool haircut and a FREE beer, go to Knockouts, they are the Hooters of Haircutting.
von El Jefe Viernes 20. Mai 2009