What does boatswain mean?
A boatswain — pronounced BOH-sun and often spelled "bosun" — is the shipboard officer responsible for the deck department: supervising the deck crew, maintaining the rigging, handling anchors and mooring lines, and keeping the vessel's hull and equipment in working order. In merchant ships the role is typically filled by an experienced seaman; in navies such as Britain's Royal Navy and the United States Navy, the boatswain is a warrant or petty officer who serves as the technical authority on all things rope, sail, and seamanship. The office is one of the oldest aboard ship, and its trappings survive in distinctive customs such as the boatswain's pipe (a silver whistle used for ceremonial piping) and the boatswain's chair (a suspended seat for working aloft). The word evokes salt-crusted maritime tradition and remains standard vocabulary in nautical contexts, literature, and formal naval usage.
nounThe ship's officer in charge of the deck crew, rigging, anchors, and general maintenance of a vessel's hull and equipment; in naval usage, the senior petty officer of the deck department.
- The warrant or petty officer on a merchant or naval ship responsible for the deck crew, rigging, anchors, and the upkeep of the hull and equipment.
"The boatswain bellowed orders across the deck as the crew scrambled to reef the sails."
"The captain entrusted the boatswain with inspecting every line and block before we weighed anchor."
"In Shakespeare's The Tempest, the boatswain famously refuses to flatter the panicking nobles during the storm."
Standard regular plural; the abbreviation "bosuns" is also common.
"Experienced boatswains were prized throughout the merchant fleet."
"Boatswain" is pronounced exactly like "BOH-sun" — the word has been slurred by sailors for so many centuries that the spelling is now just a historical souvenir.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of boatswain
The word derives from Middle English "bot(e)swain," combining "boat" with "swain," from Old Norse "sveinn" meaning boy, servant, or attendant. It entered English in the medieval period through seafaring contact with Scandinavian speakers. The second element is cognate with the modern English word "swain" (a young lover or rustic lad), both tracing back to that same Old Norse root.
Related word forms
How boatswain is actually used
Almost universally shortened in speech to "bosun" (or "bo's'n"), which has become an accepted spelling variant in its own right. The term is chiefly nautical and carries an air of old-fashioned seafaring tradition; it appears frequently in historical fiction, maritime law, and naval ceremony.
Easily confused with boatswain
A coxswain steers a boat or commands its crew (especially a rowing shell), while a boatswain supervises the deck crew, rigging, and maintenance of a larger vessel.