Foreigners have a custom. After saying or hearing unlucky words, they should touch the woodwork, say "touch the wood" and beg for bad luck to leave themselves and not come. This is equivalent to China people saying "bah" after hearing or saying China's unlucky words.
Knock on the wood if you say something unlucky;
Everyone is afraid of death, but we are afraid, but we can't escape, so we just hope it won't come so soon, and it will naturally have a bad feeling about the word death. In China, most of them are bah, while in the United States, when we say something unlucky, we will knock on the wooden table with our hands in order to get rid of it.
This is just different lifestyles in different countries and different folk customs in different regions. It is a kind of spiritual sustenance and prayer, hoping to stay away from bad luck. Knocking on wooden tables is a habit of many nationalities in the world. If you think or talk about unlucky things, knock on the nearby wooden things quickly, and things can be avoided. There are good spirits living on wood, especially oak trees, so knocking on wood will continue to bring good luck.