Definitions from Wiktionary (hot bed)

▸ noun:  A mass of organic matter decomposing and giving off heat from microbial metabolic action.
▸ noun:  A garden bed using such a heat-generating mass; a hotbox.
▸ noun:  A central point of activity, relating to a specific task.
▸ noun:  A bed shared by workers, sailors, or soldiers operating in shifts or watches (named for the idea that it is still warm when the next occupant gets into it).
▸ verb:  To share sleeping accommodations with one or two others serially (in shifts), as on ship or a submarine or other operation with round-the-clock staffing.
▸ verb:  To farm using hotbeds for season extension.

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