hot bed

Noun

 * 1) A mass of organic matter decomposing and giving off heat from microbial metabolic action.
 * 2) A garden bed using such a heat-generating mass; a hotbox.
 * 3) A central point of activity, relating to a specific task.
 * 4)  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

 * 1) 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.
 * The crew of the submarine quickly got used to hot bedding.
 * 1) To farm using hotbeds for season extension.
 * 1) To farm using hotbeds for season extension.