"Caught one short" is a phrase that means being caught in a difficult or embarrassing situation without preparation or resources. Some possible antonyms for this phrase might include being completely prepared or having ample resources on hand. Other antonyms could include being comfortable, relaxed, at ease, or untroubled. In general, antonyms for "caught one short" might include any words or phrases that suggest a lack of stress or pressure, as well as those that indicate preparedness or readiness for any situation that might arise. Ultimately, the best antonym will depend on the particular context and the intended meaning of the phrase in question.