open book

noun

someone or something easily understood or interpreted; something very clear: The child's face is an open book.

Origin of open book

First recorded in 1850–55

Words nearby open book

open and aboveboard, open and shut, open bar, open biopsy, open bite, open book, open brethren, open call, open carry, open chain, open chain compound

British Dictionary definitions for open book

open book

noun

a person or thing without secrecy or concealment that can be easily known or interpreted

Idioms and Phrases with open book

open book

Something or someone that can be readily examined or understood, as in His entire life is an open book. This metaphoric expression is often expanded to read someone like an open book, meaning “to discern someone's thoughts or feelings”; variations of this metaphor were used by Shakespeare: “Read o'er the volume of young Paris' face,” (Romeo and Juliet, 1:3) and “O, like a book of sport thou'lt read me o'er” (Troilus and Cressida, 4:5). [Mid-1800s] For an antonym, see closed book.