A prank in which one runs through a public place wearing little or no clothing, usually to amuse others.

plural of running dog

plural of hit and run

plural of hacking run

(computing) A hacking session extended long outside normal working times, especially one longer than 12 hours; sometimes an all-nighter.

(firearms) A target that is towed across a range as the shooter shoots. / A goal that changes as effort is made to reach the goal.

A brief trip across a visited country's border in order to "restart the clock" on one's visa upon returning, where it would otherwise have expired.

(idiomatic) operational, in operation

(idiomatic) To act in an uncontrolled, unbridled manner. / (idiomatic) To be uncontrollable.

plural of ski run