Quitting cold can mean to abruptly stop doing something or to abandon a plan or goal. Antonyms for this phrase could include persisting, persevering, sticking with it, continuing, and seeing something through to the end. Other opposite phrases could be gradually phasing out, easing off, or slowly reducing. It's important to note that quitting cold can sometimes be a wise decision, such as quitting a harmful addiction immediately. However, it's also important to recognize when persistence is necessary, such as when working towards a long-term goal or when facing difficult challenges. In these cases, antonyms for quitting cold can be helpful reminders to keep pushing forward.