hotbed

noun
     
hot‧bed

be a hotbed of something

a place where a lot of a particular type of activity, especially bad or violent activity, happens:
the university was a hotbed of radical protest

Dictionary results for "hotbed"
Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.