What is actually meaning of "Touchwood"?

if you are saying something and you dont want anything bad to happen you say "Touchwood"
What is reason or logic behind it? 🤔

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MrPerditus1 · 61-69, M

It derives from the pagan belief that malevolent spirits inhabited wood, and that if you expressed a hope for the future you should touch, or knock on wood to prevent the spirits from hearing and presumably preventing your hopes from coming true.