燃もゆる土つち

expression

coal; peat

Archaic expression literally meaning 'burning earth', used historically for combustible earthy materials such as coal or peat. Not used in modern Japanese.

• 古こ文ぶん書しょには「燃もゆる土つち」を燃ねん料りょうとして使つかった記き述じゅつがある。

  In old documents, there are descriptions of using 'burning earth' as fuel.