10 December 2025

Knock on wood

The phrase "knock on wood" is a ubiquitous expression used to ward off bad luck. While the phrase “knock on wood”—or “touch wood” in Britain—has been part of the vernacular since at the least the 19th century, there seems to be little agreement on how it originated.

One origin theory is that knocking on wood has its roots in ancient pagan beliefs, particularly among Celtic cultures. According to this theory, trees were considered sacred, housing spirits or minor gods. Knocking on a tree trunk was believed to rouse these spirits, seeking protection or thanking them for good fortune. This idea is supported by the fact that ancient cultures did revere trees, often associating them with powerful spirits and divine connections.

However, there's a catch: there's no direct evidence linking ancient tree worship to the modern practice of knocking on wood. The gap between the Christianization of Europe and the first written records of this superstition spans over a thousand years, making it challenging to confirm this theory.

Other possible origins include:

A medieval European belief that evil spirits or demons lurked in wood - even wood used to build a house or table - and knocking on wood would chase them away

A superstition that wood has protective powers, possibly due to its association with the cross

A simple gesture of humility, acknowledging that one's fate is not entirely in one's control

Why Do People Knock on Wood for Luck? | HISTORY.com

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