To strike a sounding blow with the fist, knuckles, or anything hard, especially on a door, window, or the like, as in seeking admittance, calling attention, or giving a signal. If you knock something or someone, you criticize them and say unpleasant things about them. The general definition for knock is the action of striking a surface with force or a sharp sound, typically to gain attention, seek entry, or indicate one's presence.

How to use knock in a sentence. To stop doing something. Often used in the imperative: He asked us to knock it off. Knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle. The shock wave creates the characteristic metallic pinging sound, and cylinder … To stop doing something.

Knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle. The shock wave creates the characteristic metallic pinging sound, and cylinder … To stop doing something. Often used in the imperative: He asked us to knock it off. To repeatedly hit something, producing a noise: If an engine is knocking, it is producing a…. Learn more. Knock accelerates conversion by removing all barriers to it. Enjoy more tours and more leases, with a lot less effort.

To repeatedly hit something, producing a noise: If an engine is knocking, it is producing a…. Learn more. Knock accelerates conversion by removing all barriers to it. Enjoy more tours and more leases, with a lot less effort.

Enjoy more tours and more leases, with a lot less effort.