a very big fire that spreads quickly and burns natural areas like woods, forests and grassland 野火：迅速蔓延并烧毁森林，森林和草原等自然区域的大火 Firefighters are battling devastating wildfires in northern California. 消防队员正在与加州北部毁灭性的野火作战。
Idioms
spread like wildfire
(of news, etc. 消息等 to become known by more and more people very quickly 像野火般蔓延；迅速传开 Rumours of his death spread like wildfire. 有关他去世的谣言像野火般迅速传开。 The news spread like wildfire. 消息不胫而走。