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Knocking on wood: superstition explained

What people believe, where it comes from and what is really going on.

The belief

After saying something hopeful, such as "I have never been ill", many people knock on wood, or say "touch wood", to avoid bad luck.

Where it comes from

The custom is said to come from the belief that spirits lived in trees, and touching a tree asked for their protection, or to thank them. Another theory links it with Christian reverence for the wood of the cross. Nobody knows.

What is really going on

A harmless gesture. It shows a common human habit of not wishing to boast about good fortune.

See also

Questions people ask

What is the superstition about knocking on wood?

After saying something hopeful, such as "I have never been ill", many people knock on wood, or say "touch wood", to avoid bad luck.

Is it true?

There is no evidence that it affects events; it is a cultural belief.

This page reports popular beliefs for interest. Superstitions do not predict or cause anything, and nothing here is advice.