run-off

noun

• 1a further competition, election, race, etc., after a tie or inconclusive result: he won only 49 per cent of the vote, so a run-off will be held

• 2 [mass noun] the draining away of water (or substances carried in it) from the surface of an area of land, a building or structure, etc.: the ratio of run-off to rainfall fertilizer run-off from the intensively farmed areas in the river basin
• the water or other material that drains freely off the surface of something: when it rains the run-off cascades down to the valley floor [count noun]:water polluted by run-offs from farmland

• 3NZ a separate area of land where young animals are kept.