Definitions
1.NounA board with a corrugated surface against which laundry may be rubbed.
2.NounSuch a board used as a simple percussion instrument.
3.NounA board fastened along a ship's gunwale to prevent splashing; a splashboard.
4.NounA stretch of ripples or bumps on a dirt or gravel road caused by interaction between traffic and road surface."washboard road"
5.NounEllipsis of washboard abs.
6.NounBaseboard; skirting board.
7.VerbTo produce a rippled texture on a surface.
8.VerbTo play a washboard.
9.VerbTo move up and down or back and forth across the surface of a hive, possibly to lay down a layer of propolis and wax.