fret verb definition in Nervous topic from the Oxford Advanced Learner's Dictionary

fret

 verb: Nervous topic
(fretting, fretted) [intransitive, transitive] fret (about/over something) | fret (that…) (especially British English) to be worried or unhappy and not able to relax Fretting about it won't help. Her baby starts to fret as soon as she goes out of the room. Fretting, he looked again at his watch.