hothouse (n.)youdaoicibaDictYouDict[hothouse 词源字典]
mid-15c., "bath house," from hot + house (n.). In 17c. a euphemism for "brothel" (similar to massage parlor); the meaning "glass-roofed structure for raising plants" is from 1749. Figurative use by 1802.[hothouse etymology, hothouse origin, 英语词源]
massage (n.)youdaoicibaDictYouDict
1874, from French massage "friction of kneading," from masser "to massage," possibly from Arabic massa "to touch, feel, handle;" if so, probably picked up in Egypt during the Napoleonic campaign there. Other possibility is that French got it in colonial India from Portuguese amassar "knead," a verb from Latin massa "mass, dough" (see mass (n.1)). Massage parlor first attested 1894, from the start a euphemism for "house of prostitution."