death slot

plural death slots

1. broadcastinggraveyard slot

   First the network bounced the series around the schedule like a beach ball, preempted it often, and then settled the show into the death slot […]

   1997, TV Guide, volume 45

   1 more example

   So they program shows exactly when TV networks don’t. They debut series on Fridays (considered “the death slot” in network TV) and over holidays.

   2015 December 16, James Poniewozik, “Streaming TV Isn’t Just a New Way to Watch. It’s a New Genre.”, in The New York Times, →ISSN