Definition of a window into/on
- This knowledge opens a window into your opponent's mind.
- The book gives the reader a window on war.
: 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 (such as glass) and capable of being opened and shut
: a space behind a window of a retail store containing displayed merchandise
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).