A washtub is a large tub for washing clothes in. Fill the washtub.
It was the whole of laundry before machines, together with a board and a mangle. A washtub was also played as an instrument in skiffle bands, with one string and a broom handle.
1nounwashtubA large tub for washing clothes in.C1
“The washtub stood in the yard from March to October.”
washtub is a tub.
From wash + tub.
Etymology from Wiktionary, CC BY-SA