noun
a long, narrow strap attached at one end to a horse's bit, typically used in pairs to guide or check a horse while riding or driving
verb
to guide or control with reins
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The rider held the reins tightly as they guided the horse through the forest.
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I'll let you take the reins on this project and see what you come up with.
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She's really good at taking the reins and getting things done.
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It's time for you to take the reins of your own life and make decisions for yourself.