The phrase "ride off" refers to leaving or departing on a vehicle, such as a horse or a motorcycle. Some antonyms or opposite words for "ride off" could be "stay put," "remain," or "linger." These words describe the act of staying or remaining in one place instead of leaving. Another word that comes to mind is "arrive," which is the opposite of leaving or departing. Instead, it means to reach a destination or come to a place. Other antonyms could include "disembark," which means to leave a ship or plane, or "dismount," which refers to getting off a vehicle or horse.