a closed book

noun
Updated on: 15 Nov 2017

Definition of a closed book

:a person or thing that is difficult to understand
  • Even to his closest friends, he was always something of a closed book.

Word by Word Definitions

closed play
  1. : not open

  2. : enclosed

  3. : composed entirely of closed tubes or vessels

book play
  1. : a set of written sheets of skin or paper or tablets of wood or ivory

  2. : a set of written, printed, or blank sheets bound together between a front and back cover

  3. : a long written or printed literary composition

  1. : derived from books (see 1book 1) and not from practical experience

  2. : shown by ledgers

  1. : to register (something, such as a name) for some future activity or condition (as to engage transportation or reserve lodgings)

  2. : to schedule engagements for

  3. : to set aside time for


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