Hang fire is a phrase that means to delay or hesitate before taking action. Its antonyms include words like act, proceed, and expedite. These words indicate a sense of urgency and a desire to move forward quickly. Other antonyms for hang fire include words like advance, accelerate, and rush. These words suggest an inclination towards promptness and efficiency. Additionally, words like prompt, swift, and immediate are also antonyms for hang fire since they convey a sense of speed and timeliness. Overall, the antonyms for hang fire lend themselves to the idea of taking swift and decisive action without undue delay.