a window into/on
Definition of a window into/on
: something that makes it possible to see or understand something clearly This knowledge opens a window into your opponent's mind. The book gives the reader a window on war.
Word by Word Definitions
: an opening especially in the wall of a building for admission of light and air that is usually closed by casements or sashes containing transparent material (as glass) and capable of being opened and shut
: a space behind a window of a retail store containing displayed merchandise
Seen and Heard
What made you want to look up a window into/on? Please tell us where you read or heard it (including the quote, if possible).