The phrase "rides knee" may have multiple synonyms depending on the context of its use. In the world of horseback riding, this phrase may refer to the ability of a rider to maintain a secure and balanced seat on the horse's back. Synonyms for this usage may include terms like "balanced seat," "equitation," or "good form." In other contexts, "rides knee" might refer to a particular riding style or maneuver, such as a knee ride in martial arts. Synonyms for this usage could include "knee lock," "leg wrap," or "grappling with the legs." Overall, the phrase "rides knee" could have a variety of synonyms depending on how it is being used.