Blue pencil and Iron curtain

Iron curtain and blue pencil are semantically related in forbiddance topic. In some cases you can use "Iron curtain" instead a noun phrase "Blue pencil".

Iron curtain noun - An impenetrable barrier to communication or information especially as imposed by rigid censorship and secrecy; used by Winston Churchill in 1946 to describe the demarcation between democratic and communist countries.

Blue pencil and iron curtain are semantically related in forbiddance topic. Sometimes you can use "Blue pencil" instead a noun phrase "Iron curtain".