Nautical term meaning on or toward the aft (rear) part of a ship; behind or to the rear of something on a vessel.
From Old English 'æftan' (behind) via 'aft' (the rear), with the preposition 'a-' (on, at). The term has been standard nautical vocabulary since medieval times and appears frequently in naval logs and ship documentation.
When sailors yelled 'abaft!' they were using a direction system that's remained almost unchanged for 1,000 years—ship design has completely transformed, but the basic ways sailors talk about position forward and backward are still the same.
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