From Longman Dictionary of Contemporary Englishduckboardsduck‧boards /ˈdʌkbɔːdz $ -bɔːrdz/ noun [plural] DLOTBClong boards used to make a path over muddy ground
Examples from the Corpus
duckboards• Lucky are those who have old fashioned duckboards for laying atop the snow.• A youth called Tipper ran along the duckboards, then stopped and lifted his face to the sky.• Douglas lay tipped out on the duckboards.• He had spread a tarpaulin over the duckboards, and on top of it they dumped blankets from the ambulance.• Sometimes there were duckboards around the lips of the huge shell craters. 