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open book Syllabification: o·pen book

Entry from US English dictionary

Definition of open book in English:

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 whippersnapper
Pronunciation: ˈ(h)wipərˌsnapər
noun
a young, inexperienced person considered presumptuous or overconfident...