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English word hotwife comes from English hot, English wife
hot (English)
(incomparable) Electrically charged.. (informal) Radioactive. [from the 20thc.]. (informal) Very good, remarkable, exciting. [from the 19thc.]. (of a person or animal) Feeling the sensation of heat, especially to the point of discomfort.. (of a temper) Easily provoked to anger.. (of an object) Having a high temperature.. (of food) Spicy.. (of the weather) Causing the air to be hot.. (slang) [...]
wife (English)
(Scotland) .. A married woman, especially in relation to her spouse.. The female of a pair of mated animals.
hotwife (English)
(slang) A married female swinger; a wife who has sex with men other than her husband, with the husband's approval. (slang) To participate in a hotwife sexual relationship.