(idiomatic) To go on a rampage; to be in an uncontrollable rage.

(idiomatic) To go unchecked, to be out of control. / (prison slang, of prison sentences) To run consecutively.

(derogatory) A lackey; a lapdog; an unprincipled person who helps or flatters other, more powerful and often evil people.

plural of run-on

(ditransitive, idiomatic) To bring an idea or proposal to the attention of (someone) in order to obtain their opinion. / (intransitive) Used other than figuratively or idiomatically: see run, past.

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

plural of running dog

(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.