into the ground: beyond what is requisite or can be endured ; to exhaustion.
work/drive/run yourself into the ground: to work so hard that you become very tired or ill.
- Kay's working herself into the ground trying to meet her deadlines.
... Collins, LDOCE
run something into the ground:
- to cause something to become less successful. ex) Unless she gets some help, she will probably run her business into the ground.
- to use something so much that it does not work any more. ex) I gave that car to my son and he ran it into the ground.
run yourself into the ground: to do so much you become unable to do anything well. ex) He'll run himself into the ground if he keeps working at this pace.
... Cambridge Dictionary of American Idioms
run into the ground:
- pursue a topic until it has been thoroughly discussed or exhausted, as in They've run the abortion issue into the ground.
- Ruin or destroy, as in During her brief time as chief executive Marjorie just about ran the company into the ground.
cf. Both usages allude to pushing something so far that it is, in effect, buried.
... The American Heritage® Dictionary of Idioms