The action or process of washing over; (Physical Geography) (a) the deposition over or beyond the marginal moraine of material carried by running water from a glacier; the material so deposited; (b) the flow of water from a lake, the sea, etc., over a low spit, berm, or other obstacle; water carried or left behind by such a flow.
Late 19th century; earliest use found in Science. From overwash.
To flow or wash over; to inundate. Chiefly in passive.
Late Middle English; earliest use found in Palladius' De Re Rustica. From over- + wash.