pair, gather, meet
逑 centers on coming together: forming a pair, gathering, or meeting. The meanings all share the idea of two or more things uniting.
逑 combines 辶 (movement) with 求, which likely contributes the sound and the idea of seeking or coming together. The exact historical development is uncertain.
The movement radical 辶 wraps around 求, like paths converging to seek something. Picture two roads meeting to form a pair or gathering.
For キュウ, imagine a pair of people meeting in a queue: queue -> キュウ, and they gather together along the path.
good spouse