Rein Definition
(now rare, archaic, chiefly in plural) A kidney.
- To stop a horse, for example, by pulling on the reins.
- To slow down or stop a horse or other animal by putting pressure on the reins.
- To restrain or control.
- To release from restraints; allow to go unchecked: gave free rein to her emotions. 
- to tighten the reins
- to slow down or stop
- to allow to act without restraint
Origin of Rein
-  Anglo-Norman reyne, from Old French resne (Modern French rêne), from Vulgar Latin *retina, from Classical Latin retineō (“to retain"), from re- + teneō. From Wiktionary 
-  Middle English from Old French resne, reine from Vulgar Latin retina from Latin retinēre to retain retain From American Heritage Dictionary of the English Language, 5th Edition 
-  From Anglo-Norman reines, Middle French reins, and their source, Latin rēnēs. From Wiktionary 
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