Definition of Davy Jones's locker noun from the Oxford Advanced American Dictionary

 

Davy Jones's locker

 noun
noun
NAmE//ˌdeɪvi ˌdʒoʊnzəz ˈlɑkər//
 
, NAmE//ˌdeɪviˌdʒoʊnzˈlɑkər//
 
[singular](informal)
 
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the bottom of the sea, where people who drown at sea are said to go From Davy Jones, a name used by sailors in the 18th century for the evil spirit of the ocean.
See the Oxford Advanced Learner's Dictionary entry: Davy Jones's locker