coursing

hunting with dogs (usually greyhounds) that are trained to chase game (such as hares) by sight instead of by scent

और इस प्रकार प्रथम लौह-अश्व ने सन् 1853 में बंबई और ठाणे के बीच दौड़ लगायी.

Neither can the sun overtake the moon, nor the night outpace the day: Each of them keeps coursing in its orbit.