split S

noun2

1. •
   An aerobatic maneuver in which an aircraft, starting from upright level flight, rolls inverted and then performs one-half of an inside loop, ending up in upright level flight in the opposite direction at a lower altitude; equivalent to an Immelmann turn (modern sense) performed in reverse.
2. •
   A grammatical system that splits the class of intransitive subjects, using a morphosyntactic alignment called active–stative alignment, or split intransitive alignment.