Ancient pagan cultures, such as the Celts, believed that benevolent and helpful spirits lived in trees. Knocking on tree trunks roused a spirit for protection, which led to the saying “knock on wood.”
Knock on wood
Ancient pagan cultures, such as the Celts, believed that benevolent and helpful spirits lived in trees. Knocking on tree trunks roused a spirit for protection, which led to the saying “knock on wood.”
