Drove themselves into the ground - Idioms by The Free Dictionary
drive (oneself) into the ground (redirected from drove themselves into the ground)
drive (oneself) into the ground
To work oneself to the point of illness or exhaustion. If you keep working 80-hour weeks, you'll drive yourself into the ground sooner than later.
drive/run/work yourself into the ˈground work so hard that you become extremely tired: You need to be careful, or you’ll run yourself into the ground before long. ♢ With only two or three hours’ sleep a night, he was driving himself into the ground.