closed book
Pronunciation
/klˈoʊzd bˈʊk/
British pronunciation
/klˈəʊzd bˈʊk/

英語での「closed book」の定義と意味

Closed book
01

閉じた本,

someone or something one knows very little or nothing about
closed book definition and meaning
IdiomIdiom
InformalInformal
example
The workings of the stock market are a closed book to me – I do n't understand how it works.
株式市場の仕組みは私にとって未知の領域です–どのように機能するのか理解できません。
The new technology is a closed book to most people – they're not familiar with it yet.
新しい技術はほとんどの人にとって未知の領域です–彼らはまだそれに慣れていません。
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