slave **
break one's back
buckle down
knuckle down

They wanted to take him out and break the back of the group.

I break my back to give you a home, put food in your mouth.

He, however, broke his back in the fall and was taken to hospital.

It felt as if I were breaking my own back.

And if you take another drink on this trip I'll break your back.

At the end I am going to squeeze you and break your back in three places.

On one day, I had to fall from a horse and nearly broke my back.

Break his back and twist it just to be sure.

"His plan is going to break the back of middle class persons in our state," she continued.

If he'd been an ordinary human, it would have broken his back.