Using his giant axe, Sabu strikes the opponent with a low, lateral blow.
"Yosaku" (与作) is the title of a 1978 hit single by Saburō Kitajima, the artist on whom the Sabu character was based. It is an enka song about a woodcutter named Yosaku. The name literally means something like gifted work or participation work.
Unusually, Sabu actually announces the name of this technique during the axe's swing — not something normally done in the series.