The definition of a tutor is a personal teacher, a teaching assistant or someone who helps a student catch up in a subject. An example of a tutor is someone who teaches a teenage celebrity. An example of a tutor is a teacher who assists a college professor with their teaching duties.
iron curtain-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.
In Berlin, the section of the iron curtain dividing West from East Germany took the form of the Berlin Wall, a long concrete wall separating Berlin into democratic and Communist parts; many East Germans lost their lives trying to escape over the wall to the West.