UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈhɒtbɛd/US:USA pronuncation: IPAUSA pronuncation: IPA/ˈhɑtˌbɛd/

WordReference Random House Learner's Dictionary of American English © 2020
hot•bed /ˈhɑtˌbɛd/USA pronunciation   n. [countable]
  1. Botanya glass structure covering a bed of earth that is heated, used for growing plants.
  2. a place, condition, situation, or environment that favors rapid growth or spread.

Collins Concise English Dictionary © HarperCollins Publishers::
hotbed /ˈhɒtˌbɛd/ n
  1. a glass-covered bed of soil, usually heated by fermenting material, used for propagating plants, forcing early vegetables, etc
  2. a place offering ideal conditions for the growth of an idea, activity, etc, esp one considered bad
WordReference Random House Unabridged Dictionary of American English © 2020
hot bed′, [Metalworking.]
  1. Metallurgyan area having rails or rolls on which rolled pieces are laid to cool.
  • 1620–30

hot•bed  (hotbed′),USA pronunciation n., v.,  -bed•ded, -bed•ding. 
  1. Botanya bottomless, boxlike, usually glass-covered structure and the bed of earth it covers, heated typically by fermenting manure or electrical cables, for growing plants out of season.
  2. a place or environment favoring rapid growth or spread, esp. of something disliked or unwanted:a hotbed of disease.
  3. Slang Termsa bed shared by two or more persons in shifts, each sleeping in it for or at a designated time and then vacating it for the next occupant.

  1. Slang Termsto share a bed in shifts, so that it is always occupied.
  • hot + bed 1620–30

'hotbed' also found in these entries (note: many are not synonyms or translations):
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