Antonyms are words that are opposite in meaning to another word. For the phrase "put on hold," antonyms could include "proceed," "continue," or "advance." These words suggest the opposite of putting something on hold or delaying it. They signify a need to move forward or to take action immediately. Other antonyms could be "resolve," "address," or "tackle," indicating that it is time to confront the issue at hand and find a solution. By using antonyms, we can expand our vocabulary and express nuance in our language, conveying the appropriate meaning of our message.