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1. To drink all of something. A noun or pronoun can be used between "drink" and "up." This smoothie is gross—I really can't drink it up. Drink up your milk, dear, we don't want it to go to waste.
2. An instruction or expression of encouragement for one to finish one's drink. In this usage, it is a set phrase. Drink up, and I'll get us another round. Drink up! You only turn 21 once!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
drink something up
to drink all of something that is served or that is on hand. Who drank all the root beer up? I drank up the root beer.
Finish your drink!; Finish that drink, and we'll have another! Okay, drink up! It's closing time. Drink up, and let's get going.
See also: drink
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To drink something completely: She drank the coffee up and set the cup on the counter. He drank up his milk and asked for more. Drink up—it's time to go.
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.
exclam. Finish your drink!; Finish that drink, and we’ll have another! Okay, drink up! It’s closing time.
See also: drink
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.