knock

1. to strike a sounding blow with the fist, knuckles, or anything hard, especially on a door, window, or the like, as in seeking admittance, calling attention, or giving a signal:

   to knock on the door before entering.

2. to strike in collision; bump:

   He knocked into a table.

3. to make a pounding noise:

   The engine of our car is knocking badly.

4. Informal. to engage in trivial or carping criticism; find fault.
5. Cards. to end a game, as in gin rummy, by laying down a hand in which those cards not included in sets total less than a specific amount.

1. to give a sounding or forcible blow to; hit; strike; beat.
2. to drive, force, or render by a blow or blows:

   to knock a man senseless.

3. to make by striking a blow or blows:

   to knock a hole in the wall.

4. to strike (a thing) against something else.
5. Informal. to criticize, especially in a carping manner:

   He's always knocking everything.

6. British Slang. to astound; impress greatly.

1. an act or instance of knocking.
2. the sound of knocking, especially a rap, as at a door.
3. a blow or thump.
4. Informal. an adverse criticism.
5. the noise resulting from faulty combustion or from incorrect functioning of some part of an internal-combustion engine.
6. Cricket. an innings.
7. British Slang.
   1. one of a combination of dealers who bid together, rather than against each other, at an auction, and later resell the purchases among themselves.
   2. an auction at which this is done.
   3. the sale of merchandise recently obtained by a dealer at an auction.

verb phrase

1. 1. Informal. to cease activity, especially work:

      to knock off at five every day.

   2. to stop doing something; quit:

      Knock it off or you'll get into a mess.

   3. Slang. to dispose of; finish.
   4. Slang. to murder; kill.
   5. Slang. to die.
   6. Slang. to get rid of; reduce.
   7. Slang. to disable or defeat.
   8. Slang. to commit a robbery at; steal from:

      The gang knocked off a gas station.

   9. Nautical Slang. to blow the head (of a sailing vessel) off the wind.
   10. to imitate, copy, or plagiarize:

       to knock off designer dresses in cheap materials.

2. 1. to sell at auction by a blow of the hammer or to a bidder.
   2. to take apart or disassemble, as for facility in handling, storing, shipping, etc.
   3. Slang. to receive, as a salary or a scholastic grade; earn:

      He knocks down 30 grand a year.

   4. Informal. to lower the price of; reduce:

      to knock down end-of-season leftovers.

   5. Slang. to embezzle or steal (money).
   6. to cause (a sailing vessel) to heel, as by a gust of wind, to such a degree that it cannot right itself.
3. 1. to defeat (an opponent) in a boxing match by striking such a blow that the opponent is unable to rise within the specified time.
   2. to render (a person) unconscious:

      Those sleeping pills knocked me out for ten hours.

   3. to make tired or exhausted:

      Christmas shopping always knocks me out.

   4. Informal. to produce quickly, hurriedly, or with ease:

      He knocks out two poems a day.

   5. to damage or destroy:

      The explosion knocked out the power for several hours.

   6. knock ( def 28 ).
4. Slang. to drink (a beverage), especially quickly and heartily:

   He knocked back two shots of vodka.

5. to make or construct in a hurry or with little attention to detail:

   He knocked together a couple of tables.

6. Informal.
   1. to wander aimlessly or idly; loaf.
   2. to mistreat (someone), especially physically.
   3. to jar; shake up.
7. 1. to strike (someone or something) from an erect to a prone position:

      to knock over a lamp.

   2. to distress; overcome:

      When the announcement came we were completely knocked over.

   3. Slang. to rob, burglarize, or hijack:

      He knocked over five banks.

8. 1. Slang. to make pregnant.
   2. to exhaust; weary; tire.
   3. to damage; mar:

      The children knocked up the new table.

   4. to injure; wound:

      He was afraid to come home from school all knocked up again.

   5. British. to wake up; rouse; call:

      He knocked us up before dawn.