معنی کلمه fretting

to be nervous or worried:
Don't fret - I'm sure he's OK.
She spent the day fretting about/over what she'd said to Nicky.
any of the small raised metal bars across the long, thin part of a stringed musical instrument such as a guitar, that show you where to put your fingers on the strings in order to produce different notes

She's always fretting about the children.