tier-boardn. a board belonging to a cable or rope tier: see 2b.
ΘΚΠ
society > travel > travel by water > vessel, ship, or boat > parts of vessels > room, locker, or quarters > [noun] > storage room or compartment > cable tier > board belonging to
tier-board1887
1887 E. J. MatherNor'ard of Dogger (1889) 81 They spread some o' the trawl-warp tier-boards along the thwarts, an' a rug on the top of 'em for me to lie on.