Function: transitive verb
Date: circa 1578
1 a : to collide with and knock down b : to run against and cause to sink
2 a : to chase to exhaustion or until captured b : to trace the source of c : to tag out (a base runner) between bases on a rundown
3 : DISPARAGE
intransitive verb
1 : to cease to operate because of the exhaustion of motive power <the clock ran down >
2 : to decline in physical condition or vigor