To envelop in a protective case.
To withdraw into such a case.
The silky protective case spun by the larvae of some insects in which they metamorphose, the pupa.
Any similar protective case, whether real or metaphorical.
To enclose or confine something on all sides so as to prevent escape.
To encircle something or simultaneously extend in all directions.
Anything, such as a fence or border, that surrounds something.