Definition
To do something with great speed and energy; as fast as possible.
全速地，飞快地
Upon hearing the alarm, they ran hell for leather towards the exit.
一听到警报，他们就飞快地朝出口跑去。
He drove hell for leather to get to the airport on time.
他飞快地开车以准时到达机场。
The athletes were running hell for leather in the final stage of the race.
运动员们在比赛的最后阶段飞快地奔跑。