IDIOMS

run off

(idiomatic) To write something quickly.

Example: To flee or depart quickly.
  Don't run off before the end of the event.
  He ran off to France leaving her with all the debts and three children to bring up.
  Please run off a couple dozen more flyers to pass out.
  Shakespeare could run off a play in just a couple of days.
(of a liquid) To pour or spill off or over.
  They kept a barrel to store rainwater that has run off the roof.
To cause to flow away.
  to run off a charge of molten metal from a furnace
To chase someone away.
  If anyone comes into this field, the bull will soon run them off.
To operate by a particular energy source.
  This radio runs off batteries.