bo's'n, bos'n see boatswain

boatswain (often bosun, bo'sun, bo's'n or bos'n) /bōˈsn/

1. The foreman of a crew (warrant officer in the navy) who looks after a ship's boats, rigging, flags, etc
2. The skua (prob from its aggressiveness)

boatˈswain-bird noun

The tropicbird

boatswain's call, boatswain's pipe or boatswain's whistle see under whistle

boatswain's chair noun (nautical)

A wooden seat slung from ropes, for a man working on a ship's side, rigging, etc

boatswain's mate noun

Boatswain's assistant

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