Definitions from Wiktionary (Iron curtain)

▸ noun:  (historical) Chiefly preceded by the: the dividing line between Western Europe and the Soviet-controlled regions, especially during the Cold War (1947–1991).
▸ noun:  (theater) A barrier made of iron in a theatre, lowered between the stage and the auditorium for safety or to prevent communication.
▸ noun:  (figurative) Any impenetrable barrier.
▸ Also see iron_curtain


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