The crossword solution for the term 'PREPARE TO RIDE, WITH 'UP'' is 'SADDLE, ' which is a six-letter word. A SADDLE is a supportive structure for a rider and their mount, typically made of leather or other durable material. It is used to provide comfort and stability for the rider while riding, and is secured to the mount with straps or girths. The phrase 'prepare to ride, with 'UP'' implies that the rider should be ready to mount the horse and ride off.