harness (someone or an animal) to (something)
To use a harness to connect someone or an animal to something. How long will it take for you to harness all of us to the rock climbing equipment? The groom is harnessing the horses to the carriage right now, my lady.
harness someone (or an animal) to something
to attach someone, something, or an animal to something with a harness. The instructor harnessed me to the hang glider, and I really began to get nervous. Andrew harnessed the horses to the little wagon.