wait on

verb10

1. •
   To provide a service to (someone); to act as a servant to (someone); to serve (someone) as a waiter or waitress in a restaurant.

   • Is someone waiting on you yet?
2. •
   (informal) To wait for (a person).

   • I'm waiting on you before we can leave.
3. •
   (informal) To wait for (a thing, or an event to take place).

   • I'm waiting on the light to change.
4. •
   To be in store for (someone).

   • the destruction that waits on Monarchs, who consider fidelity to them as the most degrading of all vices — 1796
5. •
   To fly above its master, waiting till game is sprung.
6. •
   (no longer used) To visit (someone) as a courtesy, on business or for ceremony.

   • In the Evening our Commander sent a Message to Mr. Jones, that if a Visit would not be troublesome he would wait on him. — 1749
7. •
   (no longer used) To obey and pay attention to (someone); to follow (a leader); to attend to (someone); to be subject to (someone).
8. •
   (no longer used) To carry out or perform (a duty, function, etc.).

   • Aaron and his sons […] shall wait on their priest’s office: — 1611
9. •
   (no longer used) To occur as a consequence of (something), to result from (something).

   • that ruine which waits upon such a supine temper — 1667
10. •
    (informal, no longer used) To court (someone).