Definitions
1.NounOne of a long series of boards laid from side to side as a path across wet or muddy ground; normally used in plural."In an attempt to alleviate the problem, wooden planking, known as duckboards, was placed at the bottom of trenches and across other areas of muddy or waterlogged ground."
2.NounWooden, low walkway or short part of a path with one or more planks, logs, or boards laid after each other lengthwise, often two planks wide.
3.NounA panel of wooden slats typically laid on a concrete floor in a workshop, to reduce fatigue for a person operating a machine tool or working at a bench.
4.Noun↑ C. E. W. Bean (1917), Letters from France, Cassell and Company, pages 38–39: “I have said before that you do not walk on the bottom of the trench as you did in Gallipoli, but on a narrow wooden causeway not unlike the bridge on which ducks wander down from the henhouse to the yard—colloquially known as the “duck-boards.”