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1986, "to stay inside and be inactive," from coccoon (n.).
A lady with an enchanting name, Faith Popcorn, has identified a menacing new American behavior that she gives the sweet name of 'cocooning.' It threatens the nation's pursuit of happiness, sometimes called the economy. [George Will, April 1987]Related: Cocooned; cocooning.
One's cozy home: Each morning he leaves his domestic cocoon in Rancho Palos Verdesverb
To stay at home, and, often, to be inactive: The couch potatoes are going to be cocooning in their families' personal oases (1980s+)
a case produced in the larval stage of certain animals (e.g., butterflies, moths, leeches, earthworms, Turbellaria) for the resting pupal stage (see pupa) in the life cycle. Certain spiders spin a fibrous mass, or cocoon, to cover their eggs