The phrase "catch breath" refers to taking a short moment to rest and recover one's breathing after physical exertion. Antonyms for this phrase might include "lose breath" or "run out of breath." These terms imply a more extreme physical state, where one is unable to regain normal breathing patterns or suffering from shortness of breath. Other antonyms could include "exhale fully" or "breathe steadily," indicating a calm and steady respiratory state. In contrast to "catch breath," these antonyms focus on sustained and controlled breathing rather than temporary recovery from exertion.