open book English

Meaning open book meaning

What does open book mean?

open book noun

— (idiomatic) Something of which salient aspects are obvious or easily interpreted.

— (idiomatic) A person who through naivete responds candidly to questions or openly displays their emotions or intentions.

— (mathematics, topology) An open book decomposition.

— person naively honest or open

Examples open book examples

How do I use open book in a sentence?

Simple sentences

Open your book to page nine.