a cover or case of silk threads that some insects make to protect themselves before they become adults 茧 a layer of something soft that wraps all around a person or thing and forms a protection 保护膜；防护层；软罩 - (figurative)
the cocoon of a caring family 家庭中相互关爱所形成的保护
- (figurative)
Word Originlate 17th cent.: from French cocon, from medieval Provençal coucoun ‘eggshell, cocoon’, diminutive of coca ‘shell’. The verb dates from the mid 19th cent.