The antonyms for the phrase "catching in act" include missing, ignoring, overlooking, neglecting, and dismissing potential wrongdoing. These antonyms suggest a lack of attention paid to one's surroundings or an intentional decision to not take action when suspicious behavior is observed. By contrast, catching someone in the act involves actively seeking out evidence of wrongdoing and taking action to stop it. Neglecting to do so can result in missed opportunities to prevent harm or injustice. It is important to remain vigilant and aware of our surroundings to prevent wrongdoing and hold those accountable who engage in it.