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English definition of “rein”

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rein

noun [C usually plural] uk   /reɪn/ us  
a long, thin piece of material, especially leather, that helps you to control and direct a horse: You pull on both reins to stop or slow a horse, but only the left rein to turn left. UK a strap that is put around a small child's body or wrist and held at the other end by an adult so that the adult can stop the child running away: I always put my son on reins when we go shopping.
(Definition of rein from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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