Etymology
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bosun (n.)

a mid-19c. respelling to reflect the modern pronunciation of boatswain.

updated on December 05, 2014

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Definitions of bosun from WordNet

bosun (n.)
a petty officer on a merchant ship who controls the work of other seamen;
Synonyms: boatswain / bos'n / bo's'n / bo'sun
From wordnet.princeton.edu, not affiliated with etymonline.