rope
緪 centers on a rope, specifically a thick or strong cord used for tying or securing things.
緪 combines 糸 (thread) with 恆, which likely contributes the sound コウ. The character originally referred to a thick rope or cable.
The thread radical 糸 on the left suggests something made of fibers, and the right side 恆 looks sturdy and stretched out. Picture a strong rope made from many threads twisted together.
For コウ, imagine a rope tied in a tight knot that makes a low, resonant sound when pulled: kohhh -> コウ. The sound of the rope straining under tension helps you remember the reading.
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