knocking

  1. deliver a sharp blow or push
  2. rap with the knuckles
  3. make light, repeated taps on a surface
  4. of car engines, when firing too early

Knocking

Knock'ing noun A beating; a rap; a series of raps. « The . . . repeated knockings of the head upon the ground by the Chinese worshiper.» H. Spencer.
Found on http://www.encyclo.co.uk/webster/K/16

knocking

noun the sound of knocking (as on a door or in an engine or bearing); `the knocking grew louder`
Found on http://wordnetweb.princeton.edu/perl/webwn?s=knocking

Knocking

• (n.) A beating; a rap; a series of raps. • (p. pr. & vb. n.) of Knock
Found on http://thinkexist.com/dictionary/meaning/knocking/

knocking

in an internal-combustion engine, sharp sounds caused by premature combustion of part of the compressed air-fuel mixture in the cylinder. In a ... [4 related articles]
Found on http://www.britannica.com/eb/a-z/k/41

knocking

In a spark-ignition petrol engine, a phenomenon that occurs when unburned fuel-air mixture explodes in the combustion chamber before being ignited by the spark. The resulting shock waves produce a metallic knocking sound. Loss of power occurs, which can be prevented by reducing the compression ratio, re-designing the geometry of the com...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0006585.html
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