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

 

Davy Jones’s locker

 noun
noun
BrE BrE//ˌdeɪvi ˌdʒəʊnzɪz ˈlɒkə(r)//
 
; NAmE NAmE//ˌdeɪvi ˌdʒoʊnzɪz ˈlɑːkər//
 
[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 sea.
See the Oxford Advanced American Dictionary entry: Davy Jones’s locker