dirty coal

English

Etymology

Due to the smell it gives off when burned.

Noun

dirty coal (uncountable)

1. (informal) lignite
   • 1978 February 14, “Texas Turning to Its Reserves of Lignite”, in New York Times‎:

     Lignite's nickname “dirty coal,” suggests its one major drawback, but its allure is clearly its cost. Lignite is cheaper than most other energy sources.