reins

n. controlling power, governing power

n. long thin strap on an animal's harness; means of control, restraint

v. control, restrain; control an animal by pulling on the reins

Reins are a type of horse tack. A bridle is an arrangement of straps around the horse's head used for riding and driving the animal. A bridle contains a bit (a piece of metal or rubber that is placed in the horse's mouth) attached to reins. Reins are leather straps or rope attached to the outer ends of a bit that extend to the rider's or driver's hands, allowing them to give commands known as rein aids.
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Noun
1. power to control; "the reins of government"
(hypernym) power, powerfulness

Noun
1. one of a pair of long straps (usually connected to the bit or the headpiece) used to control a horse
(hypernym) strap
(hyponym) bearing rein, checkrein
(part-holonym) bridle
(derivation) rein in
2. any means of control; "he took up the reins of government"
(hypernym) control
(derivation) rule, harness
Verb
1. control and direct with or as if by reins; "rein a horse"
(synonym) harness, rein in, draw rein
(hypernym) control, command
2. stop or slow up one's horse or oneself by or as if by pulling the reins; "They reined in in front of the post office"
(synonym) rein in
(hypernym) stop, halt
(classification) driving
3. stop or check by or as if by a pull at the reins; "He reined in his horses in front of the post office"
(synonym) rein in
(hypernym) stop
(hyponym) pull
4. keep in check; "rule one's temper"
(synonym) rule, harness
(hypernym) restrict, restrain, trammel, limit, bound, confine, throttle

n. kidney, one of a pair of organs that filters metabolic wastes from the blood

(n. pl.)
The kidneys; also, the region of the kidneys; the loins.
  

(n. pl.)
The inward impulses; the affections and passions; -- so called because formerly supposed to have their seat in the part of the body where the kidneys are.