noun
sidearm throw; throwing sideways
Refers to a throwing motion where the arm moves horizontally across the body, common in baseball and other sports.
彼は横投げでボールを投げた。
He threw the ball with a sidearm throw.
横投げの練習を始めた。
I started practicing sidearm throwing.
Compound of 横 (side) and 投げ (throw), literally 'side throw'.