1) Audacious tar of a kind 2) British Navy rank 3) Deck expert 4) Sailor 5) Salt 6) Seasoned salt 
A skilled sailor
An able seaman (AB) is an unlicensed member of the deck department of a merchant ship. An AB may work as a watchstander, a day worker, or a combination of these roles. ==Watchstander== At sea an AB watchstander`s duties include standing watch as helmsman and lookout. A helmsman is required to maintain a steady course, properly execute all rudder ....[rank] In the British Royal Navy in the middle of the 18th century, the term able seaman (abbreviated AB) referred to a seaman with at least two years` experience at sea. Seamen with less experience were referred to as landmen or ordinary seamen. ==Royal Navy== In 1653 the Royal Navy introduced a new pay scale as part of reforms following d...
Able seaman is nautical terminology for a skilled seaman, as distinct from a trained, but not skilled seaman known as an ordinary seaman, and an untrained or inexperienced seaman who is known as a boy.
[n] - a seaman in the merchant navy
able-bodied seaman noun a seaman in the merchant navy; trained in special skills