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

 

washday

 noun
noun
BrE BrE//ˈwɒʃdeɪ//
 
; NAmE NAmE//ˈwɑːʃdeɪ//
 
, NAmE//ˈwɔːʃdeɪ//
 
(also washing day)
 
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the day in somebody’s house when the clothes, etc. are washed, especially when this happens on the same day each week
See the Oxford Advanced American Dictionary entry: washday