
1) Abs 2) Splashboard
Found on
https://www.crosswordclues.com/clue/washboard

1) Abs descriptor 2) Abs-like laundry tool 3) Adjective for fabulous abs 4) Choral instrument 5) Clean-up committee 6) Device 7) Instrument 8) Kind of road 9) Laundry washing equipment 10) Melodic instrument 11) Musical gizmo 12) Musical device 13) Musical gadget 14) Musical apparatus 15) Music machine
Found on
https://www.crosswordclues.com/clue/washboard

a rough riding surface that has small bumps or undulations.
Found on
http://bikecult.com/bikecultbook/glossary_english.html

A washboard is a tool designed for hand washing clothing. With mechanized cleaning of clothing becoming more common by the end of the 20th century, the washboard has become better known for its originally subsidiary use as a musical instrument. The traditional washboard is usually constructed with a rectangular wooden frame in which are mounted a ...
Found on
http://en.wikipedia.org/wiki/Washboard

The word washboard has a few different meanings: a board for washing clothes, a nautical term for a board that keeps the sea from breaking over the side of a boat, and, of course, Channing Tatum-esque abs. This rippling stomach muscles sense—which resembles a clothes washing board—is from 1950s boxing jargon.
Found on
http://mentalfloss.com/article/63958/15-common-phrases-come-boxing

broad thin plank along ship's gunwale to keep out sea water
Found on
http://phrontistery.info/nautical.html

broad thin plank along ship's gunwale to keep out sea water
Found on
http://phrontistery.info/w.html

Thin shelf along the sides of the gunwale to prevent water from coming on deck. Most common on small, open workboats.
Found on
http://shipwrightjournal.blogspot.co.uk/p/glossary-of-nautical-terms.html

• (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. • (n.) A board running round, and serving as a facing for, the walls of a room, next to the floor; a mopboard. • (n.) A fluted, or ribbed, ...
Found on
http://thinkexist.com/dictionary/meaning/washboard/
Wash'board` noun 1. A fluted, or ribbed, board on which clothes are rubbed in washing them.
2. A board running round, and serving as a facing for, the walls of a room, next to the floor; a mopboard.
3. (Nautical) A broad, thin plank, fixed along the gunwale of boat to ke...
Found on
http://www.encyclo.co.uk/webster/W/9

the rail of the boat where the traps are laid after being hauled.
Found on
http://www.parl.ns.ca/lobster/glossary.htm

A washboard (baseboard, mopboard or scrubboard) is a board, or other woodwork, carried round the walls of a room and touching the floor, to form a base and protect the plastering.
Found on
http://www.probertencyclopaedia.com/browse/TW.HTM

[
n] - device consisting of a corrugated surface to scrub clothes on 2. [n] - protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side
Found on
http://www.webdictionary.co.uk/definition.php?query=washboard
splashboard noun protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side
Found on
https://www.encyclo.co.uk/local/20974

a narrow strake placed round a boat to keep water out
Found on
https://www.nswrowers.com/glossary.html
No exact match found.