carbo load

Consume a large amount of carbohydrate food, as in Karen began carbo loading three days before the road race. This term, a clipping of “carbohydrate loading,” originated among marathon runners, who were advised to build up their strength before a race by eating quantities of foods like spaghetti. [1970s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.