Also,
touch wood. Express a wish that something will or will not occur, as in This last round of treatment should have cured her, knock on wood. This expression alludes to an ancient superstition that literally knocking on or touching wood will ward off evil spirits. [c. 1900]
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Knocking on wood, or to touch wood refers to the apotropaic tradition in western folklore of literally touching/knocking on wood, or merely stating that you are, in order to avoid "tempting fate" after making a favourable observation, a boast, or speaking of one's own death.
In old English folklore, "knocking on wood" also referred to when people spoke of secrets - they went into the isolated woods to talk privately and "knocked" on the trees when they were talking to hide their communication from evil spirits who would be unable to hear when they knocked.
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