to join or connect the vine
丩 centers on the idea of joining or connecting, specifically like a vine that twists and links things together.
丩 is a pictograph of a twisted vine or cord, representing the idea of joining or connecting. The modern two-stroke form preserves the twisted shape.
The two strokes twist around each other like a vine wrapping around a branch, joining them together.
For キュウ, imagine a vine twisting into a tight queue: queue -> キュウ, and the vine connects everything in line.