Safe as houses

{[title|"Safe as houses"}} "" was am English language expression that befuddled the Doctor — apparently until his eighth incarnation. While in the interzone of the Divergent Universe searching for Caerdroia, he was once split into three bodies. One of his three selves finally figured out that the expression originated in a 19th century British depression in which the only financial security was in real estate. (BFA: Caerdroia)