おおかじ

おおかじ【大火事】

a big fire; a destructive [disastrous] fire; a conflagration.

●たばこなどちょっとした火の不始末が大火事につながる例は多い. It often happens that a minor act of carelessness with things like lit cigarettes leads to a major conflagration.

・〔ぼやを消し止めた後で〕 大火事にならなくてよかったね. Thank God it didn't turn into a real fire!