washboard

pyykkilauta

roiskesuoja A board with a corrugated surface against which laundry may be rubbed.
puhekieltä Such a board used as a simple percussion instrument.
puhekieltä A board fastened along a ship's gunwale to prevent splashing; a splashboard.
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 grade grading.