D defs.my
Entry 1 sense Webster, 1913

A cheval

· A· che·val · IPA
01 Astride; with a part on each side; -- used specif. in designating the position of an army with the wings separated by some line of demarcat…
  1. 1.
    Astride; with a part on each side; -- used specif. in designating the position of an army with the wings separated by some line of demarcation, as a river or road.
    “A position à cheval on a river is not one which a general willingly assumes.” — Swinton.