Third-person singular simple present indicative form of run at

Third-person singular simple present indicative form of run in

Third-person singular simple present indicative form of run for it

(informal) diarrhea

The activity of combining parkour with gymnastics to pass obstacles and demonstrate athletic talent, most often in urban environments.

Alternative spelling of run-of-the-mill

(figuratively) Ordinary; not special.

(idiomatic) A practice; a rehearsal.

(nautical) To become entangled in; to run aground on. / (idiomatic) To contravene.

(American football) An offensive back whose primary job is to be the ballcarrier.