mother-in-law room
n.— «The formal living room has fallen off the map in favor of the Great Room. In some newer homes, (mine included) there is a “living room”—although in my house it is referred to as the “Mother-In-Law Room”—as well as a Great Room.» —“What’s IN and what’s OUT for 2008?” by Sharon McKenna-Nunes Certified Staging Professionals Feb. 18, 2008. (source: Double-Tongued Dictionary)
Further reading
In 1916, a small-town newspaper in Pennsylvania printed a fanciful item about a local gathering with a guest list that included, among others, Miss Ella Vader, Mr. Ray Zor, and other punny names. This is part of a complete episode. Transcript of...
Words for “mother” begin with the letter M in many languages, but not all of them. The reason has to do with the physiology of infant vocalization. Among the first sounds babies make are bilabial sounds with an open vowel, the lips coming together...