washboardn.
英 'wɒʃbɔːd | 美 'wɔʃbɔd
中文n. （美）搓板；高低不平的路面；防波板\nadj. 搓板状的；崎岖不平的
（美）搓板；高低不平的路面；防波板
adj. 搓板状的；崎岖不平的
词根词源
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.
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