wait on

verb

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. To wait for (a person).“I'm waiting on you before we can leave.”
3. 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).