From Longman Dictionary of Contemporary Englishknock out phrasal verb1 unconscious knock somebody ↔ outUNCONSCIOUS to make someone become unconscious or go to sleep The champion knocked Biggs out in the seventh round.knock yourself out His head hit a table as he fell and he knocked himself out. The nurse gave me some medicine which totally knocked me out. → knockout1(1)2 defeat knock somebody/something ↔ outBEAT/DEFEAT to defeat a person or team in a competition so that they can no longer take part The German team were knocked out in the first round.knock somebody/something out of something He first hit the headlines when he knocked Becker out of the French Open Tournament. → knockout1(3)3 destroy knock something ↔ out to damage something so that it does not work The air raids were planned to knock out communications on the ground.4 admire knock somebody out informalADMIRE if something knocks you out, it is very impressive and surprises you because it is so good She loved the movie. It knocked her out. → knockout1(2)5 produce knock something ↔ out informalMAKE to produce something easily and quickly Paul has been knocking out new songs for the album.6 knock yourself out informalWORK HARD to work very hard in order to do something well → knock→ See Verb table
Examples from the Corpus
knock out• He is a good boxer, a powerful puncher who has knocked out 18 of his 20 opponents to date.• Jackson hit Brian hard with his left fist and knocked him out.• Why don't you start the gig with that song you wrote yourself? That'll really knock them out.• The blow to Sergeant Lewis' head had knocked him out cold.• If this performer doesn't knock the audience out, I don't know what would.knock yourself out• A koala, who was the loser in a treetop fight, fell 10m and knocked himself out.• He used the family umbrella as a parachute, fell on his head, and knocked himself out.• His head collided with a table on the way down and he knocked himself out.• Your parents have knocked themselves out for you.• I think he knocked himself out, or something.• I knock myself out to get him a pencil and he makes fun.• You simply want something so much that you knock yourself out to get it.• This project isn't that important, so don't knock yourself out trying to get it done.• If you knock yourself out you could slip under the water and drown.knock somebody/something out of something• It had knocked the breath out of him when it hit.• Seeing an actual reproduction of it knocks the wind out of me.• The bad news: A concussion that left Young woozy and knocked him out of the game.knock somebody out• I needed something to knock me out - it was the only way to escape from the pain.knock yourself out• A koala, who was the loser in a treetop fight, fell 10m and knocked himself out.• He used the family umbrella as a parachute, fell on his head, and knocked himself out.• His head collided with a table on the way down and he knocked himself out.• Your parents have knocked themselves out for you.• I think he knocked himself out, or something.• I knock myself out to get him a pencil and he makes fun.• You simply want something so much that you knock yourself out to get it.• If you knock yourself out you could slip under the water and drown.From Longman Business Dictionaryknock something → out phrasal verb [transitive] informal1to produce a lot of somethingPrice’s Patent Candle Company has been knocking out candles at its London factory since 1831.2if something knocks out a system, machine etc it stops it workingFluctuations in the mains power supply knocked out the computer which normally logs all changes in operations. → knock→ See Verb table 