cocoons

/K AH0 K UW1 N Z/
noun
  1. 1

    The silky protective case spun by the larvae of some insects in which they metamorphose, the pupa.

  2. 2

    Any similar protective case, whether real or metaphorical.

verb
  1. 1

    To envelop in a protective case

  2. 2

    To withdraw into such a case.

Source: https://en.wiktionary.org/wiki/cocoon, https://en.wiktionary.org/wiki/cocoons