Definition of open book in English:

open book

Syllabification: o·pen book

noun

  • A person or thing that is easily understood or interpreted: my life’s an open book
    More example sentences
    • From your social causes to cute pet photos, your life is a open book.
    • Harvey Pekar's life is an open book, and an illustrated one at that.
    • Tonight, her life has been an open book and a tabloid target, a rare interview with Melanie Griffith.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space