Etymology
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washboard (n.)

also wash-board, clothes-cleaning device, 1882, from wash (v.) + board (n.1). As a percussion instrument, attested from 1925; in reference to abdominal muscles, recorded from 1950 in boxing jargon. Earlier such muscle development was described as checkerboard (1893).

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Definitions of washboard

washboard (n.)
device consisting of a corrugated surface to scrub clothes on;
washboard (n.)
protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side;
Synonyms: splashboard
From wordnet.princeton.edu