running

meaning in plain English

To move fast on your feet, going somewhere quickly.

Picture yourself running from a bus that just missed you—fast feet, quick escape.

for example

The kids were running across the playground to catch the ice cream truck before it left.

Imagine you're late for the bus—your legs pump fast, your heart races, and you're moving as quick as you can. That's running: using your whole body to get somewhere sooner than walking would.