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carb1

[kahrb]
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noun Informal.
  1. a carburetor.
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Origin of carb1

First recorded in 1950–55; by shortening

carb2

[kahrb]Slang.
noun
  1. carbohydrate.
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verb (used without object)
  1. 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.
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Origin of carb2

by shortening of carbohydrate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for carbs

carb

noun
  1. short for carburettor
  2. short for carbohydrate
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for carbs

n.

see carb.

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carb

n.

1942 as an abbreviation of carburetor; c.2000 as short for carbohydrate.

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Online Etymology Dictionary, © 2010 Douglas Harper