0 to criticize someone or something, often unfairly: --
He's always running himself down.
1 to hit and injure a person or animal with a vehicle, especially intentionally: --
Two masked men on motorbikes tried to run me down.
2 to find someone or something after following or searching for him, her, or it for a long time: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
We kunnen het stap voor stap voltooien, hoe lang de weg ook is en het kan niet worden voltooid, hoe kort de weg ook is, als je niet eens je voetafdruk markeert.