hotbed

the word 'hotbed' is a compound formed from two native english words of germanic origin. literally, it referred to a bed of soil made warm by decomposing manure, used to force the rapid growth of plants. this literal sense, recorded from the early 17th century, provided a powerful metaphorical image. by the late 18th century, it began to be used figuratively to describe any environment that promotes the rapid growth or development of something, typically ideas, activities, or conditions, often with a negative connotation. the logic of the word perfectly bridges the physical and abstract, where a 'bed' signifies a foundation or place, and 'hot' intensifies it as a place of vigorous and often unchecked proliferation.

Structure: hot + bed hot (from old english 'hāt', meaning having a high temperature); bed (from old english 'bedd', meaning a piece of furniture for sleeping or a plot of ground for plants)