kāvas כָּבַס ‘to wash’ (Hebrew)

Etymology^?: a primitive root

kāvas v
1) to wash (by treading), be washed, perform the work of a fuller
 1a) (Qal) washer, fuller, treader (participle)
 1b) (Piel) to wash (garments, person)
 1c) (Pual) to be washed
 1d) (Hothpael) to be washed out