The phrase "called halt to" implies the act of stopping something abruptly or putting an end to it. Antonyms for this phrase could include "continue", "proceed", "resume", "advance", "persist", "persevere", "allow", or "facilitate". When using language, it's important to choose your words carefully to ensure that your message is being conveyed properly. Using antonyms for commonly used phrases can effectively communicate a different intent or tone, and can help avoid misunderstandings or confusion. In the case of "called halt to", using antonyms can facilitate a sense of movement and progression, rather than a sudden and jarring cessation.