knockˈout noun

1. The act of knocking out
2. A blow that knocks out
3. A conspiracy among dealers at an auction to keep prices artificially low
4. Any person or thing of outstanding attraction or excellence (informal)
5. A knockout competition
6. See also technical knockout under technical

adjective

1. (of a competition) eliminating losers at each round
2. Stunningly attractive or excellent (informal)

knockout auction noun

An auction at which the majority of bidders are dealers in league to keep prices artificially low

knockout drops plural noun (informal)

A drug put in a drink to make the drinker unconscious

knockˈ-rating noun

The measurement of freedom from knocking of a fuel in an internal-combustion engine, as compared with a standard fuel

knockˈ-up noun

(in tennis, etc) practice immediately before a match

knock about or around

1. To mistreat physically
2. To discuss informally
3. To saunter, loaf about
4. To be around in the area
5. To travel about, roughing it and having varied experiences
6. To be a casual friend of, associate with (with with)

knock back (informal)

1. To drink or eat, esp swiftly
2. To cost
3. To shock, disconcert
4. To rebuff, reject, turn down

knock cold

1. To knock (someone) out
2. To shock violently

knock copy

To disparage a rival's products

knock down

1. To fell with a blow
2. To demolish
3. To assign (an article) with a tap of the auctioneer's hammer (to)
4. To reduce in price (informal)
5. To spend (one's resources) on a drinking binge (Aust and NZ sl)
6. To misappropriate, filch (US) (knock-down adjective see above)

knock into a cocked hat see under cock¹

knock into the middle of next week (informal)

To hit (someone) very hard

knock off (informal)

1. To stop work
2. To stop, discontinue
3. To accomplish hastily
4. To deduct
5. To steal, rob (slang)
6. To copy illegally, to pirate (slang)
7. To kill (slang)
8. To have sexual intercourse with (slang)

knock on

1. To grow old (informal)
2. To knock (the ball) forward with the hand or arm (an infringement of the rules in rugby; knockˈ-on noun)

knock-on effect

The effect one action or occurrence has on one or more indirectly related matters or circumstances

knock one's head against a brick wall

To meet with total resistance or refusal to compromise

knock on the head (informal)

To suppress, put an end to

knock on wood see touch wood under touch

knock out

1. To dislodge by a blow
2. To strike unconscious or incapable of recovering in time (boxing)
3. To defeat in a knockout competition
4. To overcome, demolish, destroy, disable
5. To produce, esp quickly or roughly (informal)
6. To tire (oneself) out (slang)
7. To overwhelm with amazement, admiration, etc (slang)
8. To disable (a specific gene) in order to study the effect that it has on an organism (genetics)

knock sideways (informal)

To put off one's usual course

knock the bottom out of (informal)

1. To make, or show to be, invalid
2. To make ineffectual, bring to nothing

knock the (living) daylights out of see under day

knock together (informal)

To get together or construct hastily

knock under (archaic)

To give in, yield

knock up

1. To rouse by knocking
2. To wear out
3. To construct or arrange hastily
4. To achieve (a certain score) (games, esp cricket)
5. To practise immediately before a match (tennis, etc)
6. To make pregnant (slang)

on the knocker

1. On credit (slang)
2. Immediately, on the nail (Aust sl)

up to the knocker (obs sl)

Up to the required standard of excellence or fashion