IPA: /ˈrʌn.ɒf/
KK: /ˈrʌnˌɔf/
The water that flows away from land after rain, or the extra competition held to determine a winner when there is a tie.
After the heavy rain, the runoff from the fields caused flooding in the nearby area.
Runoff → It is formed from "run" (from Old English "rinnan", meaning to flow or move) and "off" (meaning away or from). The word "runoff" refers to water that flows away from a surface, typically after rain.
Imagine water 'flowing away' ('run') from a surface, which helps you remember that 'runoff' is the water that moves off the land.