body, self
躳 centers on the physical self: one's own body or the concept of selfhood.
躳 combines 身 (body) with 吕, which likely contributes a phonetic element. The exact historical development is uncertain, but the character is associated with the body or self.
The left side 身 is a body, and the right side 吕 looks like two stacked mouths or containers. Picture your body as a vessel that holds your self: 躳 is your body and self.
For キュウ, imagine your body as a cue stick, straight and ready to strike: cue -> キュウ, and your self is the player holding it.