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English definition of “boatswain”

boatswain

noun [C] uk (also bosun)   /ˈbəʊ.sən/ us    /ˈboʊ-/
the officer on a ship who is responsible for taking care of the ship's equipmentShip's officers
(Definition of boatswain from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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