Definition of Knock out

Babylon English Dictionary
amaze; defeat in a contest; final punch (Boxing); hit someone so hard that they lose consciousness
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Knock out Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

knock-out
\knock"-out`\, a. that knocks out; characterized by knocking out; as, a knock-out blow; a knock-out key for knocking out a drill from a collet.
knock-out
\knock"-out`\ (?), n. act of knocking out, or state of being knocked out.

ENGLISH IDIOMS 2.EDITION
hit a person until he is unconscious, out cold You punched him very hard. You knocked him out.
English Idioms WM 1.3a
hit a person until he is unconscious
You punched him very hard. You knocked him out.
Australian Slang
1. overwhelm with success or attractiveness; 2. destroy; damage severely; 3. earn: “He knocked out a living as a station hand”; 4. make; produce: “Pete knocked out a few pots”
cause one to feel excessive admiration; defeat; get the better of
exhaust oneself by excessive mental or physical work
WordNet 2.0

Verb
1. eliminate; "knock out a target"
(hypernym) eliminate, get rid of, do away with
2. knock unconscious or senseless; "the boxing champion knocked out his opponent in a few seconds"
(synonym) knock cold, kayo
(hypernym) beat, beat up, work over
(derivation) knockout, KO
3. destroy or break forcefully; "The windows were knocked out"
(hypernym) remove, take, take away, withdraw
4. overwhelm with admiration; "All the guys were knocked out by her charm"
(hypernym) overwhelm, overpower, sweep over, whelm, overcome, overtake
5. empty (as of tobacco) by knocking out; "knocked out a pipe"
(hypernym) empty
Knock out Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
A knockout (also referred to as a K.O.) is a fight-ending, winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts, Karate and other sports involving striking. A full knockout is considered any legal strike or combination thereof that renders an opponent unable to continue fighting.

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Knockout or K.O., is when one participant is unable to rise from the canvas in a full-contact combat sport, such as boxing.

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