I told him that we'd leave without him if he didn't stir his stumps

Come on, stir your stumps, we're late — Давай шевели ногами, мы опаздываем

I told him that we'd leave without him if he didn't stir his stumps — Я сказал, что если он не поторопится, то мы уйдем без него

The old man could cover ground fast, so fast in fact that the boy had to stir his stumps to keep abreast of him — Старик так несся вперед, что пацану пришлось поторапливаться, чтобы не отстать от него