This term is often used in historical contexts, especially when referring to the architecture of castles, palaces, or large estates.
Here's how it breaks down:
* Le: The French definite article "the"
* Basse: French for "low" or "lower"
* Cour: French for "courtyard"
In some contexts, it may also refer to the lower class or servants' quarters of a building.
If you provide more context about where you encountered this phrase, I might be able to give a more specific answer.