Definitions

1. adverb

riding a horse with one’s legs on either side, rather than astride the saddle.

“She rode sidesaddle down the hill, enjoying the scenery.”

2. noun

a seat or saddle for riding in this manner.

“She sat in the sidesaddle at the front of the carriage.”

3. verb

to ride a horse in this manner.

“He sidesaddled his horse and continued on the path.”