wildfire
noun [ C ] uk/ˈwaɪld.faɪər/ us/ˈwaɪld.faɪr/
野火
a fire that is burning strongly and out of control on an area of grass or bushes in the countryside
Major wildfires have destroyed thousands of acres in Idaho. 大规模的野火烧毁了爱达荷州几千英亩的土地。
Idiom
spread like wildfireidiom （疾病或消息）迅速传播开来;（消息）不胫而走
If disease or news spreads like wildfire, it quickly affects or becomes known by more and more people.
Once one child in the school has the infection, it spreads like wildfire. 一旦学校里有一个孩子受到感染，就会迅速传播开来。