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
verb
to guide or control with a rein
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The rider gently pulled on the rein to guide the horse in the right direction.
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Make sure you hold onto the rein tightly when riding the horse.
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I need to rein in my spending before I go broke.
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She had to rein in her emotions before speaking to her boss.