split-S

Short definition from Wiktionary

Noun

1. 1
   A grammatical system that splits the class of intransitive subjects, using a morphosyntactic alignment called active–stative alignment, or split intransitive alignment.
2. 2
   Alternative form of split S.
3. 3
   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.