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Entry 9 senses · 3 variants Webster, 1913

Knock

/(nŏk)/ · IPA /nɑk/
01 v. i. To drive or be driven against something; to strike against something; to clash; as, one heavy body knocks against another.
imp. & p. p. Knocked; p. pr. & vb. n. Knocking
  1. 1.
    To drive or be driven against something; to strike against something; to clash; as, one heavy body knocks against another.
  2. 2.
    To strike or beat with something hard or heavy; to rap; as, to knock with a club; to knock on the door.
    “For harbor at a thousand doors they knocked.” — Dryden.
    “Seek, and ye shall find; knock, and it shall be opened unto you.” — Matt. vii. 7.
  3. 3.
    To practice evil speaking or fault-finding; to criticize habitually or captiously.[Slang, U. S.]
Phrases & compounds
To knock about — to go about, taking knocks or rough usage; to wander about; to saunter.
To knock up — to fail of strength; to become wearied or worn out, as with labor; to give out.
To knock off — to cease, as from work; to desist.
To knock under — to yield; to submit; to acknowledge one's self conquered; -- an expression probably borrowed from the practice of knocking under the table with the knuckles, when conquered.
02 v. t. To strike with something hard or heavy; to move by striking; to drive (a thing) against something; as, to knock a ball with a bat; to knock…
  1. 1.
    To strike with something hard or heavy; to move by striking; to drive (a thing) against something; as, to knock a ball with a bat; to knock the head against a post; to knock a lamp off the table.
    “When heroes knock their knotty heads together.” — Rowe.
  2. 2.
    To strike for admittance; to rap upon, as a door.
    “Master, knock the door hard.” — Shak.
  3. 3.
    To impress strongly or forcibly; to astonish; to move to admiration or applause.[Slang, Eng.]
  4. 4.
    To criticise; to find fault with; to disparage.
Phrases & compounds
To knock in the head — to stun or kill by a blow upon the head; hence, to put am end to; to defeat, as a scheme or project; to frustrate; to quash.
To knock off — To force off by a blow or by beating.
To knock out — to force out by a blow or by blows; as, to knock out the brains.
To knock up — To arouse by knocking.
03 n. A blow; a stroke with something hard or heavy; a jar.
  1. 1.
    A blow; a stroke with something hard or heavy; a jar.
  2. 2.
    A stroke, as on a door for admittance; a rap.
    “A loud cry or some great knock.” — Holland.
Phrases & compounds
Knock off — See knock off in the vocabulary.