The day set apart in a household for clothes-washing.(noun)
The Century Dictionary (Public Domain)
Use "wash-day" in a sentence
"I mean, I'm sure if I looked under the cushions here at the hacienda or started rolling the coins in the fifty-five gallon drums I use to hold my wash-day pocket change, I could come up with a million or two."
"By mid-morning, it was all washed and wrung dry and hanging up in the garden, and Eleanor was scrubbing the kitchen floor, exactly as she usually did on wash-day, though it wasn't often that she was done this early."
"Sarah, Margherita and Elizabeth chattered away like a trio of old gossips on wash-day, while Marina ate until she couldn't eat any more, feeling completely hollow after all her exertion."