The word "fret" generally means to worry or be anxious about something. It is often used to describe a feeling of unease or concern that someone experiences, particularly when they believe that there is something they cannot control. The feeling of fretting can lead to stress and affect one’s peace of mind.
The word "fret" comes from the Old English "fretan" which means to devour, consume, or destroy. Originally, it had a more physical connotation related to wear and tear or erosion, but over time, it evolved to encompass emotional states related to worry and anxiety.