"Knocked on wood" is a common phrase used to ward off bad luck or to express hope that something will not happen. However, there are several synonyms that people use to convey the same sentiment. These include "touch wood," "cross your fingers," "break a leg," "knock on marble," and "knock on stone." Each of these phrases has its own history and cultural context, but they all share the idea of physically touching a material that is thought to have protective or lucky properties. Whether you say "knocked on wood" or one of its many synonyms, the intent is the same: to keep negative outcomes at bay and invite positive ones.