A nautical term meaning on, toward, or at the starboard (right) side of a ship.
From nautical 'a-' prefix (on, at) plus 'starboard' (right side of a ship, from Old English 'stēor-' meaning steering plus 'bord' meaning board/side).
Sailors developed a whole vocabulary of 'a-' words ('abeam,' 'astern,' 'astarboard') that worked like coordinates in 3D space—they told you exactly where something was relative to the ship without needing to say a whole sentence.
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