noun / verb
harness
HAR-nis/ˈhɑːrnɪs/
A system of straps and fittings that restrains or supports a person or animal.
The dog's leash clips to a ring on its harness.

Etymology
Old French harnois covered equipment broadly, including armor and horse trappings. The strap-based sense continues its use for an animal’s fittings; the word’s deeper origin is uncertain.
In context
to fasten the horse to the cart you need a harness and this is the harness room where all the chains leather straps and buckles are kept
More examples
- The climbers check their harnesses before leaving the ground.
- She harnesses the horse before hitching it to the cart.
- He adjusts the car seat's harness to fit his toddler.
Forms
harness · harnesses · harnessed · harnessing
unharness verb — To remove a harness from an animal.