Suisse

Tu fais suisse. You live alone; you are a misanthrope. Suisse means porter or door-keeper, hence “Parler au Suisse” (“Ask the porter,” or “Enquire at the porter’s lodge”). The door-keeper lives in a lodge near the main entrance, and the solitariness of his position, cut off from the house and servants, gave rise to the phrase. At one time these porters were for the most part Swiss.