"Calling a halt to" is an idiom that means to stop or cease doing something. Some of the antonyms for this phrase could include continuing, persisting, or resuming the activity. Other options might include carrying on, forging ahead, pressing on, or pushing through. These antonyms convey a sense of determination and drive to keep going, even in the face of obstacles or difficulties. However, it's worth noting that sometimes it's important to call a halt to something in order to evaluate and reassess the situation. Ultimately, the choice of whether to continue or halt an activity will depend on the specific circumstances and goals involved.