柯林斯词典fire extinguisher (also fire-extinguisher) (fire extinguishers) 1. N-COUNT A fire extinguisher is a metal cylinder which contains water or chemicals at high pressure which can put out fires. 灭火器 返回 fire extinguisher剑桥词典a device containing water or a special gas , powder , or foam (= a mass of small bubbles ) that is put onto a fire to stop it from burning 灭火器 返回 fire extinguisher