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1. A change caused by the sea: "Of his bones are coral made: / Those are pearls that were his eyes: / Nothing of him that doth fade, / But doth suffer a sea change" (Shakespeare).
2. A marked transformation: "The script suffered considerable sea changes, particularly in structure" (Harold Pinter).
a seemingly magical change, as brought about by the action of the sea
[coined by Shakespeare, in Ariel's song 'Full Fathom Five' in The Tempest (1611)]
a major transformation or alteration.