"扑灭火" 的英文是 "extinguish a fire"。
来源： "Extinguish" 是英语中的动词，意思是 "熄灭，扑灭"，而 "fire" 是名词，意思是 "火"。
例句：
The firefighters were able to extinguish the fire before it could spread to other buildings.
(消防队员们设法在火灾蔓延到其它建筑物之前将其扑灭。)
He quickly grabbed the fire extinguisher to extinguish the small flame.
(他迅速抓起灭火器扑灭小火苗。)
The city is offering free fire extinguisher training to residents to help them extinguish fires in their homes.
(城市正在向居民提供免费的灭火器培训，以帮助他们扑灭家中的火灾。)