This is an etymology thread! What exactly is a
clue? A ball of yarn, as used by
Ariadne to guide Theseus out of the labyrinth.
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Why is an oil
derrick so called? Because hangman
Thomas Derrick invented a convenient new kind of gallows.
Why does
skirt sound like
shirt? Originally the same garment, it diverged in Old Norse and Old German: when the Norse peoples met the Germans in England they started using both.
Anyone have any others?