Another adventure on the Euphemism Treadmill.
From Wikipedia (https://en.wikipedia.org/wiki/Euphemism#Lifespan):
Euphemisms frequently over time themselves become taboo words, through the linguistic process known as semantic change (specifically pejoration) described by W. V. O. Quine,[17] and more recently dubbed the “euphemism treadmill” by Harvard professor Steven Pinker.[18] For instance, toilet is an 18th-century euphemism, replacing the older euphemism house-of-office, which in turn replaced the even older euphemisms privy-house and bog-house.[19] The act of human defecation is possibly the most needy candidate for the euphemism in all eras. In the 20th century, where the old euphemisms lavatory (a place where one washes) or toilet (a place where one dresses[20]) had grown from long usage (e.g. in the United States) too synonymous with the crude act they sought to deflect, they were sometimes replaced with bathroom (a place where one bathes) washroom (a place where one washes) or restroom (a place where one rests) or even by the extreme form powder-room (a place where one applies facial cosmetics). The form water closet, which in turn became euphemised to W.C., is a less deflective form.
