confine, tie up, imprison, shack
縶 centers on restricting movement by binding or fastening: tying up, confining, imprisoning, or shackling someone or something.
縶 combines 執 (to hold, seize) with 糸 (thread), suggesting the idea of holding or binding with rope. The exact historical development is uncertain, but the component relationship is consistent with the meaning of tying up.
The top part 執 means to hold or seize, and the bottom 糸 is thread. Imagine seizing someone and tying them up tightly with thread: that's confining and imprisoning them.
For チュウ, picture a prisoner tied up in a cell, chewing on the ropes in frustration: chew -> チュウ, and the ropes confine them.