"Gone to Davy Jones's Locker" is an old nautical phrase that means someone or something has sunk or died in the sea. There are several synonyms to this phrase including "foundered," "submerged," "capsized," "lost at sea," "buried in the deep," "swallowed by the abyss," "fallen off the earth," "into the briny deep," "washed away," and "sunk without a trace." These phrases are commonly used in literature, movies, and songs that depict the dangers and the mysteries of the deep sea. They highlight the perilous and unpredictable nature of the ocean and express the sadness and finality of those who are lost at sea.