Cracking down on something often means enforcing rules or laws in a stricter way, but there are several antonyms that indicate a softer approach. One such word is "relaxed." If you relax your policies or your grip on something, you are taking a more lenient stance. Another antonym is "pardoned." If you pardon someone for a wrongdoing, you are forgiving them and letting them off the hook. "Overlook" is another antonym, indicating that you are consciously ignoring or disregarding something, rather than attempting to address it head-on. "Permitted" is another word that indicates a lenient stance, implying that you are allowing something to happen rather than cracking down on it.