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Eat very little, as in Jan is very thin—she eats like a bird. This simile alludes to the mistaken impression that birds don't eat much (they actually do, relative to their size), and dates from the first half of the 1900s. An antonym is eat like a horse, dating from the early 1700s, and alluding to the tendency of horses to eat whatever food is available. For example, I never have enough food for Ellen—she eats like a horse!
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
