A Myth Hiding in an Everyday Word
When a detective follows a clue, they are, etymologically speaking, following a thread. Not metaphorically. The word "clue" literally meant a ball of thread, and its modern meaning descends directly from one of the most famous stories in Greek mythology: the tale of Theseus and the Minotaur.
The Original Meaning
The word "clue" is an alternate spelling of "clew," which in Old English (cleowen) meant a ball of yarn or thread. For centuries, that was all it meant. If you asked a medieval English speaker for a clue, they would hand you something you could knit with.
The spelling "clew" is still used in sailing today, a clew is the lower corner of a sail where ropes attach, a usage derived from the same idea of a ball of wound line.
The Myth That Changed Everything
In Greek mythology, King Minos of Crete kept the Minotaur, a monster with the body of a man and the head of a bull, in an elaborate labyrinth designed by the architect Daedalus. The labyrinth was so complex that no one who entered could find their way out.
When the Athenian hero Theseus volunteered to slay the Minotaur, Ariadne, the daughter of Minos, gave him a ball of thread. Theseus tied one end to the entrance and unwound the thread as he went deeper into the maze. After killing the Minotaur, he followed the thread back to the entrance and escaped.
This story was enormously popular in medieval and Renaissance Europe. English writers began using "clew" figuratively: anything that guided you through a confusing situation, the way Ariadne's thread guided Theseus, was a "clew." By the 17th century, the figurative meaning had overtaken the literal one. The spelling shifted to "clue," and the ball of thread was forgotten.
Why This Matters
The story of "clue" demonstrates how mythology can permanently reshape language. Every detective novel, every mystery show, every time someone says "I don't have a clue", they are invoking a Greek myth, whether they know it or not. The thread that guided Theseus out of the labyrinth has been guiding English speakers through confusion for four hundred years.
It also illustrates a common pattern in etymology: concrete objects become abstract concepts. A physical thread becomes a piece of evidence. A real labyrinth becomes any confusing situation. Language moves from the tangible to the intangible, and the original image fades, but never quite disappears.
Related Words
Clew preserves the original spelling and is still used in nautical contexts. Labyrinth comes from the same myth. Thread itself is used metaphorically in phrases like "thread of an argument," echoing the same idea of following a line through complexity.