had been vaporing

• past perfect progressive

  past perfect progressive

  Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.

  of vapor.
  vapor

  noun

  a visible exhalation, such as fog, mist, steam, smoke, or noxious gas, diffused through or suspended in the air.

Related Words

• condensation
• fog
• gas
• moisture
• smog
• smoke
• steam