work on
verb1
To apply mental or physical effort to (something) in order to shape, form, improve, investigate, solve it, etc.
- John's in the studio working on the plans for the new house.
- I've been working on this problem for several days, but I still haven't figured it out.
2
To exercise influence on someone.
- Leave it to me. I'll try to work on the boss to give us the day off.
3
Used other than figuratively or idiomatically: see work, on.
- Do you work on Sundays?