"Gone Davy Jones' locker" is a phrase used to describe something or someone that has disappeared or vanished without a trace. Some synonyms for this phrase include "lost at sea," "cast adrift," "vanished without a trace," "sunk to the bottom," and "disappeared beneath the waves." These phrases are commonly used in nautical contexts, referring to ships that have been lost in the ocean, often due to storms, accidents, or attacks from pirates. In everyday language, these phrases may also be used metaphorically to describe something that has been lost or forgotten, or a person who has disappeared completely.