"Catches one short" is an idiomatic expression that means to be caught off guard or to be suddenly confronted with a problem or an urgent need. Some of the antonyms for this term include "well-prepared," "ready," "forewarned," "informed," "organized," or "planned." Being well-prepared can help you avoid being caught short, and it involves making contingency plans and anticipating potential problems. Being ready means being mentally and physically prepared to handle any situation that may arise. Being forewarned means having advance knowledge about a potential problem or impending danger. Being informed means having the necessary information at your disposal to make informed decisions. Finally, being organized and well-planned means having a clear roadmap for achieving your goals and contingencies in place in case of unexpected events.