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English definition of “rein”

rein

noun [C usually plural]     /reɪn/
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.Horse ridingHorse racingCords, ropes, cables and string 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.Cords, ropes, cables and stringChildren and babies
(Definition of rein noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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