curtain off

verb2

1. •
   To separate, isolate or block by means of a curtain or other barrier.

   • The encircling, mile-high mountains of the Coeur d'Alene mining area, rich in lead, zinc and silver, curtain off the sunlight except for a few midday hours. — 1960
2. •
   (figurative) To isolate.

   • I am talking about a way of regarding our world as amenable to investigation and interrogation without magic keys, special jargons and instruments, curtained-off practices. — 1993