Washboard n. : A fluted, or ribbed, board on which clothes are rubbed in washing them.

Washboard n. : A board running round, and serving as a facing for, the walls of a room, next to the floor; a mopboard.

Washboard n. : 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.

Example:
where can I get a Washboard / a wringer / a hand powered washing machine in the UK?

Taxonomy
washboard, washboards, musical instrument, ridges, percussion instrument, Zydeco, rubboard, the Washboard, clothing, bottle openers, free encyclopedia, vest frottoir, hand washing, tapping, washboard player, band, drums, rhythms.

Defination from the web:
washboard is a tool designed for hand washing clothing. ... The traditional washboard is usually constructed with a rectangular wooden frame in which are mounted a series of ridges or corrugations for the clothing to be rubbed upon. ...