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sick as a dog

Very ill, especially from a stomach malady. For example, I don't know what was in that stew but I was sick as a dog all night. This simile was first recorded in 1705. Why a dog should be viewed as particularly sick remains unclear.

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

Related Words for sick as a dog

restless, sickly, groggy, anxious, squeamish, uncomfortable, uneasy, fidgety, diseased, ill, weak, feeble, woozy, infirm, ailing, afflicted, poorly, disordered, indisposed, down