Definition of open book in English:

open book

Syllabification: o·pen book

Entry from US English dictionary

noun

A person or thing that is easily understood or interpreted: my life’s an open book

Definition of open book in:

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily