http://www.wordreference.com/definition/fret7 be agitated or irritated; "don't fret over these small details"
10 worry unnecessarily or excessively; "don't fuss too much over the grandchildren--they are quite big now"
The others have told you what it means. It's certainly an imperative, of a kind you often meet in speech with the verb worry - not to worry. I suppose fret is close enough to worry to borrow its particular imperative form.What is the meaning of “not to fret” in
everything is shiny, captain. Not to fret.
is it imperative?
Do you mean that this special imperative form is only for the verb "fret"?! and we can not use it for other verbs?Off hand I can't think of other verbs which can have this form of imperative. I remember being rather shocked by it when I first came across it as a child of eight, and thinking it was loose speech.
Of course the formal imperative would be Don't fret or Don't worry.
Other European languages use the infinitive as an imperative as one often sees on road signs - in France and Italy, for instance.
I said I couldn't think of any other verbs that took that form of imperative. That doesn't mean there aren't any. I suppose that people are often telling others not to worry, so it's not surprising it's developed a form of its own.Do you mean that this special imperative form is only for the verb "fret"?! and we can not use it for other verbs?
Ask not what you can do for your country. Ask what's for lunch.