wingover

/W IH1 N G AH1 V ER0/
noun
  1. 1

    An aerobatic maneuver in which an airplane makes a steep climb followed by a vertical flat-turn (the plane turns to its side, without rolling) and a short dive, levelling out to fly in the opposite direction from which the maneuver began.

Source: https://en.wiktionary.org/wiki/wingover