“Bidies-in”: a couple who are living together without the benefits of marriage. (Sounds much sweeter than “shacked-up”)
“Moiety”: a half, or a portion, e.g. “She ate a moiety of the delicious apple pie which was offered for dessert”.
SOURCE: “The Importance Of Being Seven” – the latest novel in Alexander McCall Smith’s “44 Scotland Street” series., which are set in Edinburgh.