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Definition of Knock out
1. Verb. Eliminate. "Knock out a target"
2. Verb. Knock unconscious or senseless. "They want to knock out the prisoners "; "The boxing champion knocked out his opponent in a few seconds"
Exact synonyms: Kayo, Knock Cold
Generic synonyms: Beat, Beat Up, Work Over
Derivative terms: Knockout
Generic synonyms: Beat, Beat Up, Work Over
Derivative terms: Knockout
3. Verb. Destroy or break forcefully. "The windows were knocked out"
4. Verb. Overwhelm with admiration. "All the guys were knocked out by her charm"
5. Verb. Empty (as of tobacco) by knocking out. "Knocked out a pipe"
Generic synonyms: Empty
Definition of Knock out
1. Verb. (transitive) To strike or bump (someone or something) out. ¹
2. Verb. (transitive idiomatic) To render unconscious, as by a blow to the head. ¹
3. Verb. (transitive idiomatic) To put to sleep. ¹
4. Verb. (transitive idiomatic) To exhaust. ¹
5. Verb. (transitive idiomatic) To complete, especially in haste; knock off. ¹
6. Verb. (transitive idiomatic) To cause a mechanism to become non-functional by damaging or destroying it. ¹
7. Verb. (sports) To eliminate. ¹
¹ Source: wiktionary.com