the main character in the book Robinson Crusoe by Daniel Defoe. When Robinson Crusoe's ship sinks, he manages to reach a desert island (=a small tropical island with no people living on it) where he builds a home. Later he meets a black man whom he calls Man Friday, who becomes his servant and friend. They are both finally discovered by a British ship and taken home.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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