Frettning
Frettning is a term originating from Germanic languages, meaning to gnaw, bite, or worry. In its most common usage, it refers to a state of mental distress, anxiety, or deep concern. A person who is fretting is often experiencing agitation and may be preoccupied with a particular problem or worry. This can manifest as restlessness, an inability to concentrate, or a general feeling of unease.
The word "fretting" can also describe the physical act of wearing something down through friction or rubbing.
Historically, the concept of fretting has been explored in literature and psychology as a component of human