Deflagrate is a word that means to burn rapidly and with great intensity, typically resulting in the emission of flames and sparks. The antonyms for deflagrate are words that represent the opposite of this process. Some antonyms for deflagrate include extinguish, quench, smother, stifle, suffocate, and suppress. Extinguish represents the act of putting out a fire or flame, whereas quench denotes the action of cooling the flames. Smother, stifle, suffocate, and suppress refer to putting an end to the flames by suffocating or suppressing them. These antonyms are useful in describing the act of stopping, preventing, or halting fire or flames.