BOSUN Meaning of BOSUN in English bo ‧ sun /ˈbəʊs ə n $ ˈboʊ-/ BrE AmE noun [countable] an officer on a ship whose job is to organize the work and look after the equipment SYN boatswain Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012