This word, generally speaking, means behind, inferred relatively, beginning from the stem and continuing towards the stern, that is, the hinder part of the ship.
♦ Abaft the beam implies any direction between a supposed transverse line amidships and the stern, whether in or out of the ship. It is the relative situation of an object with the ship, when that object is placed in the arc of the horizon contained between a line at right angles with the keel and the point of the compass which is directly opposite the ship's course. An object
as a man overboard
is described by the look-out man at the mast-head as abeam, before, or abaft the beam, by so many points of the compass. As a vessel seen may be "three points before the beam," &c.