Definition of coffin noun from the Oxford Advanced American Dictionary

 

coffin

 noun
noun
NAmE//ˈkɔfən//
 
(also casket)
 
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  • a box in which a dead body is buried or cremated A procession of mourners slowly followed the coffin.
  • Idioms
    a nail in somebody's/something's coffin
     
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    something that makes the end or failure of an organization, someone's plans, etc. more likely to happen This latest defeat is another nail in the government's coffin.
    See the Oxford Advanced Learner's Dictionary entry: coffin