what is (a steep flight of stairs) in this sentence ? is it an idiom?
Down a steep flight of stairs in the basement of a bombed-out building lives more than 14,000 pieces of hope and inspiration.

Question

what is  (a steep flight of stairs) in this sentence ? is it an idiom?
Down a steep flight of stairs in the basement of a bombed-out building lives more than 14,000 pieces of hope and inspiration.

Answer

No, it's not an idiom. We describe a sharp upward angle as "steep". A set of stairs is called a flight.

The hope and inspiration are salvaged books.  The text is here:

http://nicol29ad.tumblr.com/post/149209369977/secret-library?is_related_post=1

Answer

In this sentence, 'a steep flight of stairs' is talking about the steep angle of the stairs that lead to the basement. It wouldn't be an idiom, although I think the 'pieces of hope and inspiration' is probably a metaphor for something.
Hope this helps :)

Verpassen Sie nicht die Gelegenheit, bequem von zu Hause aus eine Sprache zu lernen. Stöbern Sie in unserer Auswahl an erfahrenen Sprachlehrern und melden Sie sich jetzt zu Ihrer ersten Unterrichtsstunde an!