rein /reɪn/ noun [C usually plural]
F0 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.See picture: reins 
Thesaurus+: ↑Horse riding , ↑Horse racingThesaurus+: ↑Cords, ropes, cables and string
F0 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.Thesaurus+: ↑Cords, ropes, cables and stringThesaurus+: ↑Children and babies- ♯ Mergers and takeovers
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