Run-off or runoff may refer to one of the following.

• runoff, an excessive water e.g., from precipitation of snowmelt, possibly carrying chemical substances, such as fertilizers.
• Runoff voting, a voting system.
• Text formatting computer programs:
  • RUNOFF -- the first computer type-setting program, on the CTSS operating system
  • runoff - the type-setting program on the Multics operating system

• wiktionary:Runoff -- other dictionary meanings