Definition of washboard noun from the Oxford Advanced Learner's Dictionary

 

washboard

 noun
noun
BrE BrE//ˈwɒʃbɔːd//
 
; NAmE NAmE//ˈwɑːʃbɔːrd//
 
, NAmE//ˈwɔːʃbɔːrd//
 
 
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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
See the Oxford Advanced American Dictionary entry: washboard