washboard
noun [ C ] uk/ˈwɒʃˌbɔːd/ us/ˈwɑːʃˌbɔːrd/
(FOR WASHING)
洗衣板，搓板
a board with a series of raised wood or metal lines on it, used in the past when washing clothes. The clothes were rubbed against the board to help clean them.
(INSTRUMENT)
（洗衣板式）敲击板（一种摩擦、敲击节拍的乐器）
a similar board used as a simple musical instrument that is rubbed or hit