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carb

2 [kahrb] Slang.
noun
verb (used without object)
2.
to eat large quantities of carbohydrates before a major physical exertion in order to store up energy (usually followed by up ): Some marathon runners carb up on spaghetti the night before a race.

Origin:
by shortening of carbohydrate

carb-

variant of carbo- before a vowel: carbazole.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
carb (kɑːb)
 
n
1.  short for carburettor
2.  short for carbohydrate

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

carb
1942 as an abbreviation of carburetor; c.2000 as short for carbohydrate.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

carb- pref.
Variant of carbo-.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
carb
  1. carburetor

  2. carbohydrate

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
They're expensive, but have a lot of fiber and really curb that carb craving.
Then there are the muscles, which account for about three-quarters of all carb
  reserves.
Some are high carb, while others high fat and protein.
Low carb diets generally restrict the amount of carbohydrates but do not
  restrict protein sources.
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