"Flap over" is a phrasal verb that means to be upset or worried about something that is not important or significant. Some synonyms for "flap over" include "fret," "agonize," "stress," and "worry excessively." Other alternatives include "obsess," "fuss," "bother," "fear," "panic," and "overreact." All these words convey a sense of negativity or concern, but they do not necessarily mean the same thing. Depending on the context, using the right synonym can add depth and clarity to your communication. Choosing the right synonym can help you convey the intended meaning of the sentence in a more precise and impactful way.