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A silk (纟) rope that controls a horse, tied to the field (畺) — a bridle or rein.

reins
to break free from reins; out of control
to let the horse go its own way; to act freely
the fetters of fame and wealth
He didn't want to be bound by the fetters of fame and wealth, so he chose a simple life.
He held the horse's reins tightly to prevent it from being startled.
After retirement, he traveled freely without a fixed plan.
The horse suddenly broke free from its reins and galloped wildly across the grassland.
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Characters pronounced "jiang".
Characters with radical "纟".