Definitions from Wiktionary ( )

▸ noun:  A strap or rope attached to a bridle or bit, used to control a horse, animal or young child.
▸ noun:  (figurative) An instrument or means of curbing, restraining, or governing.
▸ verb:  (transitive) To direct or stop a horse by using reins.
▸ verb:  (transitive) To restrain; to control; to check.
▸ verb:  (intransitive) To obey directions given with the reins.
▸ noun:  (now rare, archaic, chiefly in plural) A kidney.
▸ noun:  The inward impulses; the affections and passions, formerly supposed to be located in the area of the kidneys.
▸ noun:  A surname from German.
▸ noun:  (telecommunications) Acronym of repetitive electrical impulse noise.

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