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Explanation: Apparently a Cevennois/Ardechois dialect term for an open-fronted stone-built shed or lodge used to shelter bulky machinery (pressoir), or vehicles, that won't go through a door. May be a lean-to, though not by any means necessarily so. Given that the source is dialect and that the context is real estate, it might be acceptable to leave the source term as is with an appropriate English gloss e.g. "calabert" (open-fronted stone-built shelter) converted to dining room.