barn, stable
厩 centers on a building for housing livestock: a barn or stable where animals are kept.
厩 combines the enclosure 厂 (cliff or building) with 既, which likely contributes the sound and may relate to the idea of sheltering or finishing. The exact historical development is uncertain.
The outer 厂 is like a simple roof or shed. Inside, 既 looks like a person with a container, suggesting someone who has already finished feeding the animals. Together, 厩 is the barn where the work is done.
For キュウ, imagine a cute little barn: cute -> キュウ, and the barn is where the animals stay.