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snug as a bug in a rug

snug as a bug in a rug idiom

Very cozy and comfortable, as in During the blizzard we had plenty of firewood and stayed in the cottage, snug as a bug in a rug. This expression, thought to allude to a moth larva happily feeding inside a rolled-up carpet, was first recorded in 1769 and probably owes its long life to the rhyme.

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.