1.a support consisting of an arrangement of straps for holding something to the body (especially one supporting a person suspended from a parachute)
2.stable gear consisting of an arrangement of leather straps fitted to a draft animal so that it can be attached to and pull a cart
1.put a harness;
harness the horse
2.exploit the power of;
harness natural forces and resources
3.control and direct with or as if by reins;
rein a horse
4.keep in check;
rule one's temper