Р-38

С РАЗБЕГА (-y) PrepP these forms only adv

while running, having gained speed, while in full motion

at a run

from a running start (in refer, to very fast motion only) at a dead run.

На этот призыв выходит из толпы парень и с разбега бросается в пламя (Салтыков-Щедрин 1). ( context transl ) At this appeal a lad came forward from the crowd, took a running leap and hurled himself into the flames (1a)