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1. To drink something, usually an alcoholic beverage, quickly. A noun or pronoun can be used between "knock" and "back." Let's get together and knock back some cold ones tonight.
2. To physically force someone or something backwards. A noun or pronoun can be used between "knock" and "back." The rumbling of the earthquake knocked us all back.
3. To cost someone a particular amount of money. A noun or pronoun can be used between "knock" and "back." Geez, how much is this car repair going to knock me back?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
knock one backverb
knock something back
tv. to drink down a drink of something, especially something alcoholic. (see also knock back a drink.) John knocked back two beers in ten minutes.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.