go to Davy Jones's locker
go under
verb
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To enter a trance, state of hypnosis, etc.
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To be named; to call oneself.
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To collapse or fail, e.g. by going bankrupt.
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To descend into a body of water; to founder.
How often have the words go to Davy Jones's locker and go under occurred in a corpus of books? (source: Google Ngram Viewer )