In-flame is a verb that means to light up, ignite or intensify something. Its antonyms are words that mean to extinguish, diminish, or calm down. One antonym of in-flame is "extinguish" which means to put out a fire or to bring an end to something. Another antonym is "reduce" which means to lessen the intensity or amount of something. Additionally, "soothe" is an antonym of in-flame, meaning to calm or pacify something or someone. Other antonyms for in-flame include abate, dampen, and settle. These words can be used in various contexts, such as putting out a fire or calming down a heated argument.