Knock \Knock\, v. i. [imp. & p. p. Knocked; p. pr. & vb. n. Knocking.]

[OE. knoken, AS. cnocian, cnucian; prob. of imitative origin; cf. Sw. knacka.Cf. Knack.]

1. To drive or be driven against something; to strike against something; to clash; as, one heavy body knocks against another. --Bacon.

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.

To knock about, to go about, taking knocks or rough usage; to wander about; to saunter. [Colloq.]

``Knocking about town.'' --W. Irving.

To knock up, to fail of strength; to become wearied or worn out, as with labor; to give out. ``The horses were beginning to knock up under the fatigue of such severe service.'' --De Quincey.

Source: Webster's Revised Unabridged Dictionary (1913)