(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.
JigHexadecimal tarafından 26 Ağustos 2007, Pazar

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Top Definition
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.

GMG1 tarafından 2 Ocak 2008, Çarşamba

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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.
noooooooooope tarafından 7 Haziran 2009, Pazar

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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.
Mon-Mon tarafından 13 Ağustos 2007, Pazartesi

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To go to sleep.
I'm so tired so I'm gonna knock out!
Blabbermouth tarafından 23 Haziran 2014, Pazartesi

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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.
ben renner tarafından 22 Haziran 2005, Çarşamba

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when having sex, you go for at least three rounds that are at least 30 minutes long and you don't cum until the the third or later round
round one=no cum, round two=no cum, round three=cum and KNOCK-OUT
Wizzard the Juggalo tarafından 9 Aralık 2010, Perşembe

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