To understand the hidden or implied meaning in something, especially when the real message is not explicitly stated.
This phrase originated from a method of secret communication where invisible ink was used to write messages between the visible lines of an innocent-looking letter. The recipient would apply heat or chemicals to reveal the hidden text. The figurative meaning developed in the mid-1800s.
The phrase reflects humanity's long history of coded communication - from ancient cryptography to modern subtext in literature and conversation. What's fascinating is that we're constantly 'reading between the lines' in daily life, interpreting facial expressions, tone of voice, and what people don't say, making us all amateur cryptographers of human emotion.
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