"Catches short" means to be taken by surprise or to experience an unexpected and urgent need, such as the need to use the bathroom. There are a few antonyms for this phrase that describe the opposite situation.
One antonym could be "well-prepared," which means to be fully equipped and ready for any situation. Another antonym could be "anticipating," which means to expect or foresee something that might happen. Finally, "untroubled" could also be an antonym for "catches short," describing a state of calm and relaxation without any urgent needs or worries.
By understanding the antonyms of "catches short," we can better prepare ourselves for unexpected situations and avoid being caught off guard.