wildfire

US /ˈwaɪld.faɪr/
UK /ˈwaɪld.faɪr/
"wildfire" picture
1.

a large, destructive fire that spreads quickly over woodland or brush

:
The dry conditions led to a massive wildfire.
Firefighters are working to contain the wildfire.
2.

a rapidly spreading and uncontrollable phenomenon or situation

:
The news spread like wildfire across the internet.
The new trend caught on like wildfire among teenagers.