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.
curtain. n. 1. a piece of material that can be drawn across an opening or window, to shut out light or to provide privacy. 2. a barrier to vision, access, or communication: a curtain of secrecy. 3. (Theatre) a hanging cloth or similar barrier for concealing all or part of a theatre stage from the audience.