Even modest storms can knock out power to some customers for a week or more.
A “solar geometric storm” could knock out the satellites our banks, military, and wireless devices need to function.
Romney failed to knock out Perry, who failed to knock out Romney.
More millions were spent trying to knock out Democratic candidates in four states, and to oppose gay marriage in California.
The only way of freeing myself was to knock out by main strength either the top or one side of the bunk or chest.
But you may hail away, so, for ever, and you will not knock out what we can.
But from what we have done already the sailors know that our ships here can knock out those forts here.
It was to knock out the end of our car, and drop the rails on the track as we ran.
Wading into the water a bear will knock out the salmon right and left when they are running thick.
He left it there, and then the boy began to knock out the wedge.
Old English cnocian (West Saxon cnucian), "to pound, beat; knock (on a door)," likely of imitative origin. Meaning "deprecate, put down" is from 1892. Related: Knocked; knocking. Knock-kneed first attested 1774. Knock-down, drag-out is from 1827. Command knock it off "stop it" is first recorded 1880, perhaps from auctioneer's term for "dispose of quickly:"
At the commencement of the sales, he gave every one that wanted to purchase a paper containing a description of the lands that were to be sold; and, as the sales were cried, he called over the numbers and described the land; and when it got up to one dollar and a quarter an acre, if no body bid, after it was cried two or three times, he would say, knock it off, knock it off. [U.S. Senate record, 1834]
mid-14c., from knock (v.). As an engine noise, from 1899.
: It wasn't a disinterested comment—it was a knock/ The knock on Fernandez is he can't field
"Though Orientals are very jealous of their privacy, they never knock when about to enter your room, but walk in without warning or ceremony. It is nearly impossible to teach an Arab servant to knock at your door. They give warning at the outer gate either by calling or knocking. To stand and call is a very common and respectful mode. Thus Moses commanded the holder of a pledge to stand without and call to the owner to come forth (Deut. 24:10). This was to avoid the violent intrusion of cruel creditors. Peter stood knocking at the outer door (Acts 12:13, 16), and the three men sent to Joppa by Cornelius made inquiry and 'stood before the gate' (10:17, 18). The idea is that the guard over your privacy is to be placed at the entrance." Knocking is used as a sign of importunity (Matt. 7:7, 8; Luke 13:25), and of the coming of Christ (Luke 12:36; Rev. 3:20).