The phrase "puts the freeze on" is often used to describe a situation where things come to a standstill or are halted completely. Some possible antonyms for this phrase could include "starts up," "revs up," "gets going," "accelerates," or "ignites." These words suggest movement, progress, and forward momentum rather than a state of being stuck or stagnant. Other antonyms for "puts the freeze on" could include "activates," "bursts into motion," or "launches," all of which convey a sense of dynamism and energy. By using these antonyms, you can convey a more positive and proactive tone in your writing.