wash
noun
1.
3.
the dry bed of an intermittent stream (as at the bottom of a canyon)
4.
the erosive process of washing away soil or gravel by water (as from a roadway)
5.
the flow of air that is driven backwards by an aircraft propeller
6.
a watercolor made by applying a series of monochrome washes one over the other
7.
8.
any enterprise in which losses and gains cancel out