Got astride is an action that denotes a person getting on top of something, usually an animal or a vehicle. The antonyms for got astride can be different based on the context of the usage. For example, if we are referring to getting off an animal, the antonyms could be dismount, disembark, or get down. Similarly, if we are talking about getting off a vehicle, the antonyms could be alight, descend, or step off. The key to finding antonyms for got astride is to identify the opposite action of getting on top of something. So, depending on the situation, antonyms for got astride could include dismounting, disembarking, getting down, alighting, descending, or stepping off.