KNOCK, verb intransitive nok.

1. To strike or beat with something thick or heavy; as, to knock with a club or with the fist; to knock at the door. We never use this word to express beating with a small stick or whip.

2. To drive or be driven against; to strike against; to clash; as when one heavy body knocks against another.

To knock under, to yield; to submit; to acknowledge to be conquered; an expression borrowed from the practice of knocking under the table, when conquered.

KNOCK, verb transitive nok. To strike; to drive against; as, to knock the head against a post.

1. To strike a door for admittance; to rap.

To knock down, to strike down; to fell; to prostrate by a blow or by blows; as, to knock down an ox.

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. In popular use, to beat out; to fatigue till unable to do more.

To knock off, to force off by beating. At auctions, to assign to a bidder by a blow on the counter.

To knock on the head, to kill by a blow or by blows.

KNOCK, noun nok. A blow; a stroke with something thick or heavy.

1. A stroke on a door, intended as a request for admittance; a rap.