"Catch act" denotes the art of capturing someone in the act of doing something, usually illegal or mischievous. Antonyms for this phrase include words like "miss," "ignore," or "overlook." When one misses or ignores someone's wrongdoing, it becomes impossible to catch them in the act. Other antonyms may include "protect," "defend," or "shelter," suggesting that one is not only failing to catch the individual in their wrongdoing but actively preventing others from doing so. Overall, the antonyms for "catch act" denote a lack of action or attention when it comes to stopping or noticing someone's misconduct.