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knock someone back (an amount of money)
to cost an amount of money. That trip to Spain knocked me back almost $3,500. How much did that new furniture knock us back?
knock something back
Sl. to drink down a drink of something, especially something alcoholic. (See also knock back a drink.) I don't see how he can knock that stuff back. John knocked back two beers in ten minutes.
Also, knock it back. Gulp down an alcoholic beverage, as in He knocked back glass after glass of wine, or I hear you've been knocking it back a bit. [First half of 1900s]
1. To hit someone or something abruptly, repelling it: With a swing of the racket, she knocked the ball back to her opponent. The blast from the explosion knocked me back into the fence. The post was crooked, so I got a hammer and knocked it back into place.
2. To drink something, especially an alcoholic drink, quickly or in large amounts: After he knocked back six beers, we took his car keys away. She knocked the rest of the bottle back and went to bed.