The operating of a new engine (especially that of a motor vehicle) at less than its normal speed until proper working has been established.

A surname.

plural of Running

present participle of run at

present participle of run for it

(participial adjective; editing, typography) (not comparable) Having been run in before or behind previous text.

Alternative spelling of run-in (omitting the hyphens from nouns of this type is nonstandard in formal publications but widely seen in unedited writing)

(transitive, informal, chiefly passive) To arrest; (especially) to track down and arrest. / (transitive, Britain) To use new machinery at less than full speed, preventing damage.

(intransitive) To move forward quickly upon two feet by alternately making a short jump off either foot. (Compare walk.) / (intransitive) To go at a fast pace; to move quickly.

Act or instance of running, of moving rapidly using the feet. / Act or instance of hurrying (to or from a place) (not necessarily on foot); dash or errand, trip. / A pleasure trip.