Definition of hot blast in English:

hot blast

noun

  • The practice of preheating the air forced into a blast furnace in order to improve the efficiency of working of the furnace; the blast of hot air so used.

Origin

Mid 19th century. From hot + blast.

Pronunciation

hot blast

/ˌhɒt ˈblɑːst//ˌhɒt ˈblast/