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eat like a bird

eat like a bird idiom

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!

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.