an open book






an open book

a thing of which all have deep knowledge or understanding

1944 - Frank Clune - The Red Heart - The desert is an open book to the man of the Vast Open Spaces, but to the schoolmaster it was a closed book.




Related Idioms and Phrases :



be open with

speak frankly to

conceal nothing from



in the open = into the open

out of doors

not under cover

not subject to concealment or obfuscation

made public



open-and-shut

(of a case or argument) admitting no doubt or dispute

straightforward and conclusive



open sesame

a marvelous or irresistible means of achieving access

In the tale of Ali Baba and the Forty Thieves in the Arabian Nights, the door of the robbers' cave was made to open by uttering this magic formula.



with your eyes open = with open eyes

fully aware of the risks and other implications of an action or situation




an open book :






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