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warm as toast

Comfortably warm, as in It was freezing outside, but we were warm as toast in front of the fire. Despite the British custom of serving toasted bread in a rack that rapidly cools it, this idiom originated in England, at first as hot as toast (c. 1430) and by the mid-1800s in its present form.

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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.