noun
underhand throw; submarine pitch
Baseball term for a pitch delivered with the hand below the waist, often sidearm or submarine style. Wasei-eigo derived from 'underthrow'.
wasei-eigo (Japanese-coined English), from underthrow
彼はアンダースローから鋭い変化球を投げる。
He throws a sharp breaking ball from a submarine delivery.
アンダースローの投手は打者にとって打ちにくい。
Submarine pitchers are hard for batters to hit.