WASH-BOARD, noun [wash and board.] 1. A broad thin plank, fixed occasionally on the top of a boat or other small vessels side, to prevent the sea from breaking over; also, a piece of plank on the sill of a lower deck port for the same purpose. 2. A board in a room, next to the floor.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI