The phrase "as snug as a bug in a rug" is an English idiom that has been in use for centuries. It is attributed to an anonymous author, with its origins dating back to the 16th century. The phrase is used to convey a sense of comfort, warmth, and coziness.
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The sentence for the word "snug" is: She curled up in the snug armchair by the fire with a warm blanket.