Knock Nevis - a Norwegian supertanker formerly known as Seawise Giant, Happy Giant, and Jahre Viking
Engine knocking - in spark-ignition internal combustion engines occurs when combustion of the air/fuel mixture in the cylinder starts off correctly in response to ignition by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front
Knock (play) - (1922) by Jules Romains about a doctor
Knock (short story) - by Fredric Brown, supposedly the shortest short-story ever written
The Knock - a UK television drama, running from 1994 to 2000
Getting the wind knocked out of you - a commonly used idiom that refers to a kind of diaphragm spasm that occurs when sudden force is applied to the abdomen which puts pressure on the solar plexus
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