silky envelope spun by the larvae of many insects to protect pupas and by spiders to protect eggs
"The silkworm carefully wove its own silky envelope, a protective cocoon that would eventually hide its transformation into an adult moth."
The silky protective case spun by the larvae of some insects in which they metamorphose, the pupa.
"The caterpillar disappeared into its silken cocoon to transform into a butterfly."
retreat as if into a cocoon, as from an unfriendly environment
"Families cocoon around the T.V. set most evenings"
"She loves to stay at home and cocoon"
wrap in or as if in a cocoon, as for protection
"After the storm knocked out the power lines, they had to wrap the fragile solar panels in heavy blankets to protect them from the freezing rain."
To envelop in a protective case
"The caterpillar spun a silk cocoon to envelop itself before transforming into a butterfly."