pile the work on
To continually or consistently increase the amount of work one or someone else has to do. If he keeps piling the work on like this, he's going to drive himself to an early grave. The boss has been piling the work on us lately in order to get this project finished before Christmas.
pile the work on (someone)
Fig. to give someone a lot of work to do. The boss really piled the work on me this week. The boss piled on the work this week.