Hell for leather

A few minutes later I was driving hell for leather to Parel, some six miles out of Bombay, where Colonel Liston was in charge of the government laboratory.

It was one of the pleasures of the country to be able to ride hell for leather in the early morning... .

Of course, we were programmers, so we knew how hard it was, and what really impressed us was that this wasn't just smart programming, it was smart maths. Somebody had gone hell for leather making the absolute best that was possible.

When Alfie had breathlessly told him that Sarah had gone into labour and was on her way to hospital, he'd dropped the lead rein and headed back hell for leather.