why “wood” and not “iron”?
Ciao. I think it was an ancient belief that spirits inhabited wood, so people touched or knocked on wood to prevent the spirits from spoiling their hopes and aspirations.
Other countries may have different explanations. Hope this helps a bit. A dopo…
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I don’t know if you would know it, because it’s quite old, but to me one of the most well known usages of the expression is in the chorus of this song
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Oh Madonna! So cool eh! Remember it as a classic; here I was just waiting for the bridge to break with all those cool hip moves 
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Thanks for explanation
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