A stretch of ripples or bumps on a dirt or gravel road, mostly occurring at corners; which is caused by wear from traffic, erosion from wet weather, or poor grading
{i} board with corrugated surface for scrubbing laundry; musical instrument that looks like a washboard and used as a percussion instrument to produce a scratching sound (Music); thin and wide board placed on a boat's gunwale to prevent water from splashing over the side (Nautical); mopboard, baseboard, narrow board along the base of an interior wall; road surface that is uneven and rough (term used in USA & Canada)
protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side device consisting of a corrugated surface to scrub clothes on
A broad, thin plank, fixed along the gunwale of boat to keep the sea from breaking inboard; also, a plank on the sill of a lower deck port, for the same purpose; called also wasteboard