1To conquer or defeat an enemy or opponent; to win against someone in conflict.
彼らは最後の戦いで敵軍に打ち勝った。
They defeated the enemy army in the final battle.
大会では地元チームが強豪相手に打ち勝った。
In the tournament, the local team beat a strong opponent.
2To overcome difficulties or hardships; to prevail over problems or adversity.
彼女は長い闘病の末に病気に打ち勝った。
After a long struggle with illness, she overcame the disease.
経済的な苦境に打ち勝つために、会社は新しい戦略を採った。
To overcome financial hardship, the company adopted a new strategy.
3To out-hit — to perform better in hitting (e.g., in sports) or to hit more effectively than the opponent.
彼は速球に臆せず打ち勝ち、ヒットを連発した。
He wasn't intimidated by the fastball and out-hit it, producing successive hits.