Domain name backordering is a service that allows anyone to reserve a domain name in the event that the name is not yet available to the public.
If there is a domain name you wish to use, but is currently owned by another party, you can submit a domain name backorder request to the registrar. The registrar will notify you when that domain expires and becomes publicly available again.
However, this could also work on your domain name, if someone else should have interest in it.
If you are looking for a domain name backordering service, you should look for a backorder serving that works with a few registrars. The more registrars mean better odds of a successful backorder.