washboard

Etymology

From wash + board.

noun

A board with a corrugated surface against which laundry may be rubbed.
Such a board used as a simple percussion instrument.
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 caused by interaction between traffic and road surface.“washboard road”
Baseboard; skirting board.

verb

To produce a rippled texture on a surface.“Doug came up with a half-guilty smile and washboarded his forehead at her.”
To play a washboard.“It's almost as if the urge to washboard is intrinsically human.”
To move up and down or back and forth across the surface of a hive, possibly to lay down a layer of propolis and wax.“Individual bees have been observed washboarding on the inside glass of an observation hive.”