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Open book
/ˈəʊpən bˈʊk/
/ˈoʊpən bˈʊk/
[noun]
Open book
[NOUN]
1
a person or a thing that is easy to understand, transparent, or revealing
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Examples
1.
The
quiz
is
open book
.
2.
These
machines
are
open books
,
for
cognitive
hackers
like
me
.
3.
Be
an
open book
.
4.
We
're
open book
.
more
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