Definition of hot working in US English:

hot working

noun

Metallurgy
  • The process or an act of working metal (as by rolling, forging, etc.) at a high temperature, usually above the recrystallization temperature.

Origin

Mid 19th century; earliest use found in The Mechanics' Magazine. From hot + working.

Pronunciation

hot working

/ˈhɒt ˌwəːkɪŋ/