the ship that took the Pilgrim Fathers to Plymouth, Massachusetts in the US in 1620. They were PuritanS, who left England because they wanted to start a new society where they would be free to practise their religion. In the US people sometimes say, either seriously or jokingly, that someone's family "came over on the Mayflower", when they mean that someone's family originally arrived in the US a very long time ago.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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