Past tense of clue; gave someone information or a hint to help solve a problem, or provided someone with understanding about something.
From clue (which derives from ball of thread used to find one's way through a maze, from Old English clew). The verb developed in the 15th-16th centuries meaning to provide guidance.
The word 'clue' comes from the Greek myth of Theseus—Ariadne gave him a ball of thread (clew in Old English) to follow through the Minotaur's labyrinth, so 'clue' literally means a thread that guides you through confusion.
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