the world > movement > rate of motion > swiftness > going swiftly on foot > go swiftly on foot [verb (intransitive)] > run > start running (3)
To make a rush forward; to take off at a run. Also to take a head. Obsolete.
intransitive. To depart quickly or suddenly; to run away; to go off. Cf. sense 60b.
To make a dash; to set off at a run. So to break back: to set off running in a reverse direction. U.S., Australian, and New Zealand.