à cheval

adverb

à che·​val ˌä-shə-ˈväl 

1

: with a leg on each side : astride

2

: in such a way as to be played or chanced simultaneously on two numbers or events (as in roulette)

Word History

Etymology

borrowed from French, literally, "on horseback"

First Known Use

1832, in the meaning defined at sense 1