The phrase "collects oneself" refers to the act of regaining composure or control over one's emotions or thoughts. Its antonyms include terms such as "lose one's cool," "fall apart," "lose composure," or "lose self-control." These phrases indicate a lack of control or inability to handle stressful or emotional situations effectively. Other antonyms for "collects oneself" might include terms such as "panic," "freak out," or "blow one's top," which all indicate extreme emotional reactions to stress. Conversely, the phrase "collects oneself" implies a deliberate and intentional effort to remain calm and focused, even in the face of adversity.