fret
verbUK /frɛt/
US /frɛt/
To worry a lot about something.
Don't fret about the test; you studied hard.
OTHER MEANINGS
2. To rub or wear away something by constant rubbing.
The rope began to fret against the sharp rock.
3. A small ridge of wood or metal on the neck of a guitar or similar instrument.
He pressed the string down behind the third fret.
4. An irritated or worn spot on the skin or a surface.
The horse had a fret where the saddle rubbed.