An "idiom" is what?
A. A phrase which is clearly understood by knowing
the definitions of the words used.
B. A phrase not understood by the definitions of the
words alone.
C. A phrase from a foreign language.

answer: i have found the same question on

maybe this might .

good luck.

what are the lines. come on!

may we see the excerpt?

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.