The phrase "cry a river" typically means to cry a lot or cry excessively. Its antonyms, or opposite meanings, could include phrases such as "keep it together," "stay calm," or "don't let it get to you." These alternatives suggest having control over one's emotions and not allowing them to take over. Other antonyms could include "laugh it off," "brush it off," or "be stoic." These phrases indicate a lack of emotional attachment to a situation or the ability to move on quickly. In essence, the antonyms for "cry a river" describe emotional resilience and the ability to handle difficult situations with grace and composure.