To go ashore or leave a ship; to disembark (though this spelling is archaic).
From dis- + bark (from Italian barca, 'boat'). This is an older spelling of disembark, seen in 17th-18th century texts but now largely replaced.
Disbark is a ghost of maritime history — 'disembark' won out as the standard term, but disbark still haunts old nautical texts and period novels.
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