The phrase "missed boat" refers to an opportunity that has passed by and cannot be regained. Antonyms for "missed boat" include "seized opportunity," "captured moment," or "capitalized chance." These phrases suggest that one has made the most of a situation, rather than letting it pass them by. Another antonym could be "timely action," indicating that one took advantage of an opportunity at just the right moment. In contrast, a synonym for "missed boat" might be "lost chance," which implies regret for what could have been. Remember, while opportunities may be lost, new ones always arise, so keep an open mind and be ready to seize the moment!