wash·board
noun/ˈwɒʃbɔːd/
/ˈwɑːʃbɔːrd/
- a board with a surface with ridges on it, used in the past for rubbing clothes on when washing them; a similar board played as a musical instrument
（洗衣用）搓板；（打击乐器）刮板 Oxford Collocations DictionaryWashboard is used before these nouns:- stomach