The first horse often goes hell for leather, hits a few fences but gets away with it.

第一匹马往往跑得飞快，会撞落几根横杆，但一般不会被罚分。

《柯林斯英汉双解大词典》

She wrote the first draft in one hell for leather month.

他拼命地在一个月里写出了初稿。

youdao

I saw two young motorcyclists riding hell for leather down the road.

我看见两位摩托车手沿着公路飞驰而去。

youdao

It made light bets in plain old stocks and bonds and went hell-for-leather into exotic and illiquid holdings: commodities, timberland, hedge funds, emerging-market equities and private equity partnerships.

FORBES: Magazine Article