work on

Verb

 * 1)  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.
 * 1)  To exercise influence on someone.
 * Leave it to me. I'll try to work on the boss to give us the day off.
 * Do you work on Sundays?
 * Do you work on Sundays?