run into. collide.
runner, n. [racer], [sprinter]; [messenger], [courier].
running, a. [successive], consecutive; [flowing], [easy], cursive; [continuous]; [trailing].
running after. pursuit.
running away. [desertion], fleeing, absconding, elopement.
running down. [decline], [deterioration]; [decrial], [disparagement].
running into. [collision].
running out. expiration, [extension], expatiation, extinction.
run out. expire; [extend], [spread]; [expatiate], descant; become extinct.
run over. [overflow].