to flush out (a hare, fox, etc.); to drive out; to beat out; to start
to drive (cattle, sheep, etc.); to urge on; to spur (a horse)
to drive (to do); to urge; to spur on; to push; to impel
勢子が山から鹿を駆り立てた。
The beaters flushed deer out of the mountain.
猟犬が草むらから鳥を駆り立てている。
The hunting dogs are flushing birds out of the thicket.
勢子たちは声を上げて獲物を谷間へと駆り立てていった。
The beaters raised their voices and drove the game down toward the valley.