for all (one) cares(redirected from for all they care)
for all (one) cares
One does not care (if something were to happen). The phrase always precedes or follows some hypothetical situation. You can starve to death for all I care. I am not giving you any more of my leftovers.
for all I care
I don't care if (something happens). For all I care, the whole city council can go to the devil. They can all starve for all I care.