The term 'ACT NERVOUSLY' can be broken down into three crossword solutions: FIDGET (6 letters), PACE (4 letters), and PACED (5 letters). Fidgeting is a common behavior when someone is feeling anxious or nervous, and it involves making small movements with the hands or feet. Pacing is another behavior associated with anxiety, which involves walking back and forth in a repetitive manner. Finally, pacing can also be used as a verb, meaning to move or act in a hurried or agitated manner. All of these behaviors are indicative of someone who is feeling nervous or anxious.