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.
Although not well received at the time, as the Cold War strengthened the phrase gained popularity as a short-hand reference to the division of Europe. The Iron Curtain served to keep people in and information out, and the metaphor eventually enjoyed wide acceptance in the West. A variant, the Bamboo Curtain, was coined in reference to Communist China. As the standoff between the Free World and the countries of the Iron and Bamboo curtains eased, with the West's victory in the Cold War, the term fell out of any but historical usage.