Here's the breakdown:
* Ancient Beliefs: In many ancient cultures, trees were seen as sacred and possessing magical powers. People believed that the spirits of the trees could provide protection and good fortune.
* Touching Wood for Protection: Touching wood was a way to connect with these spirits and invoke their blessings. It was believed that the wood's energy could ward off bad luck or protect against something negative happening.
* Evolution of the Phrase: Over time, the specific belief in tree spirits faded, but the act of touching wood as a way to avoid bad luck remained. The phrase "touch wood" became a way to express this superstition, often used after someone makes a boastful statement or expresses optimism about a future event.
In short, "touch wood" is a remnant of ancient belief systems, a superstitious act intended to ward off misfortune.