Dis-mount refers to the act of getting off a horse, bicycle, motorcycle, or any form of transportation. Antonyms for the word dis-mount would include mount, board, embark, and climb aboard, which all imply getting on or getting into a vehicle or object of transportation. Other antonyms could include stay, remain, and keep still, which involve staying in one place and not dismounting. However, these words are not direct antonyms, as they do not specifically refer to the act of getting on or off a mode of transportation.