LanGeekLanGeek Dictionary

Closed book

British pronunciation/klˈəʊzd bˈʊk/
American pronunciation/klˈoʊzd bˈʊk/
Closed book
[NOUN]
1

someone or something one knows very little or nothing about

synonyms : enigma
mystery
secret
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Examples
1Each student must individually finish the closed book part.
2So the closed book part is largely qualitative.
3That quiz will be here, closed book, one sheet of notes, piece of paper both sides as your reference material.
4There is a closed book part and an open book part.
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