exhausted, impoverished, poor
竆 centers on a state of complete depletion: being exhausted, impoverished, or poor. It describes running out of resources, energy, or means.
竆 is a variant form of 窮, combining 穴 (cave, hole) with 躳 (body), suggesting being trapped or bent in a cave, leading to exhaustion and poverty. The exact historical development is uncertain.
A body 躳 trapped inside a cave 穴 has no way out, so it becomes exhausted and impoverished.
For キュウ, imagine a body in a cave letting out a desperate 'cue!' for help: cue -> キュウ, and the sound echoes in the empty cave.