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| carb up (shortening of "carbohydrate": 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. 'More); carb (shortening of "carbohydrate": 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. 'More) | |||