/bəˈtrā/
He betrayed his friend by telling their secret to their enemy.
彼は友人の秘密を敵に伝えて彼を裏切った。
The spy betrayed his country by selling secrets to the enemy.
スパイは秘密を敵に売って祖国を裏切った。
She betrayed her husband by having an affair with another man.
彼女は別の男と浮気をしたので夫を裏切った。