WordNet
n. a dive in which the diver throws the feet forward and up to complete a half backward somersault and enters the water facing the diving board
Usage examples of "half gainer".
In regular bounds the white haired girl vaulted and spun against the sky: back triple somersault, front triple somersault, half gainer, recovery, full gainer, recovery, jack-knife opening backwards in a reverse swan, triple back, then triple front again.
My mind did a leap and a half gainer and landed back where it started.
She stood up to wave at Pat and promptly executed a near-perfect half gainer off the cart, ending with a face-plant in the mud.
Somehow, Rick managed to throw himself into a half gainer, and landed almost feet first in the black waters of the canal.
He waited until he caught a glimpse of Sasaki stepping off the ladder, then he gripped the hatch tightly and swung himself headfirst through the opening, making a clumsy half gainer to the gangway below.