What Does the Expression “Read Between the Lines” Mean and Where Did the Idiom Come From?

Sometimes the truth is obscured within the written text of a letter, and so we must “read between the lines.”

Centuries ago it was discovered that by writing a secret message between the lines of a normal letter with lemon juice, the real message would stay transparent until the document was heated over a flame.

The heat from the flame causes the juice to become discolored, revealing the intended message written between the lines of the ruse.

what does the expression read between the lines mean and where did the idiom come from
About Karen Hill

Karen Hill is a freelance writer, editor, and columnist for zippyfacts.com. Born in New York, she loves interesting random facts from all over the world.