on the waiting list
on a/the waiting list
On a list of other people waiting to do something, obtain something, enter into some place, or go some place. We're putting you on a waiting list for a new kidney, but I have to warn you that there are already a lot of people ahead of you. They didn't offer me a spot right away in next year's admissions, but the university said they'd put me on the waiting list.
on the waiting listand on the wait list
[for someone's name to be] on a list of people waiting for an opportunity to do something. I couldn't get a seat on the plane, but I got on the waiting list. There is no room for you, but we can put your name on the waiting list.