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cheat sheet

American  
[cheet sheet] / ˈtʃit ˌʃit /

noun

Informal.
  1. a sheet of paper or a digital document containing information used by a student for cheating on an exam or in the classroom.

    She had a cheat sheet for the history test with a list of the correct answers.

  2. a document containing notes or other aids used as a reference in studying or remembering certain information.

    I used a cheat sheet with statistics and bar graphs to prepare for my radio interview.


Etymology

Origin of cheat sheet

First recorded in 1935–40