To keep safe; to defend; to guard; to prevent harm coming to.
To book a passenger on a later flight if there is a chance they will not be able to board their earlier reserved flight.
To wait for (a thing, or an event to take place).
To provide a service to (someone); to act as a servant to (someone); to serve (someone) as a waiter or waitress in a restaurant.
To wait for (a person).
To fly above its master, waiting till game is sprung.
To be in store for (someone).