What is reading between the lines?
It means trying to understand the deeper meaning of literature rather thatn just the written words.
You probably mean "reading between the lines." This means looking for non-literal meaning. For example, if you asked someone to dinner and she said, "Thanks, but I have to wash my car this evening," you could read between the lines and realize that she probably didn't want to come to dinner with you.
If you are referring to the phrase "read between the lines" it can mean a number of things. The first, and most used in a literary context, is that when someone asks you to "read between the lines" they are asking you to look beyond the first impression, and search for deeper meaning. The second is used in a negative and rude way, where if someone raises their pointer, middle, and ring finger at you…