hothouse

A heated greenhouse.

An environment in which growth or development is encouraged naturally or artificially; a hotbed.

This had given him the strength to leave cadet school at seventeen and volunteer for active service, reach the rank of second lieutenant no later than his hothouse-bred contemporaries, begin his military studies in the General Staff Academy itself, and, still only twenty-five, graduate not only with top marks but with promotion out of turn for special excellence in military science.

In 1906 and 1907 defeat was not yet total, society was still on the boil, spinning around the rim of the maelstrom. Lenin had sat in Kuokkala, waiting in vain for the second wave. But from 1908, when the reactionary rabble had tightened its grip on the whole of Russia, the underground had shriveled to nothing, the workers had swarmed like ants out of their holes and into legal bodies—trade unions and insurance associations—and the decline of the underground had sapped the vitality of the emigration too, reduced it to a hothouse existence. Back there was the Duma, a legal press—and every émigré was eager to publish there.

An environment full of conflict or plots.

As with much of Carsley's reign, England entered this Athens hothouse with sub-plots in the background, this time the nine withdrawals from the squad which was met with a critical public response from the normally strictly-on-message captain Harry Kane.

A bagnio, or bathing house; a brothel.

Let a man ſweat once a weeke in a Hothouſe, and be well rubd and froted with a good plumpe juicie wench, and ſweet linnen, he ſhall ne’re ha’ the Poxe.

and now she professes a / hot-house, which I think is a very ill house too.

A heated room for drying greenware.

To provide (a child) with an enriched environment with the aim of stimulating academic development.

she had such an exceptional grasp of maths in her first two years at the school theyʼd been hothousing her to sit her GCSE Maths two years early