The phrase "calls halt to" means to stop something or bring it to an end. Its antonyms would be words or phrases that express the opposite meaning or result. Some of the antonyms for "calls halt to" include "begin," "continue," "go ahead," "proceed," "resume," and "carry on." These words signify that a particular action, event, or process should start or continue in spite of any objections or obstacles. Using these antonyms can help add variety and diversity to one's vocabulary and convey different meanings and nuances in communication.