- A strap or rope attached to the bridle or bit, used to control a horse or other animal.
- to direct or stop a horse by using reins
- (usually "rein in") to stop or restrain a horse. Also used figuratively
Etymology: Anglo-Norman redne, from Old French resne (modern ríne), from Vulgar Latin , from Latin retinere "retain", from re-Latin, re- + tenere.
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Full Definition of rein