1. 1〔仲間との約束・信義を破る〕betray;《口》 double-cross
    • 友人を裏切る
    • betray one's friend
    • 彼に裏切られたような気がする
    • I feel that I have been cheated [betrayed] by him.
    • 彼は私に対する約束を裏切った
    • He broke his promise to me./He went back on his word.
    • 彼が私を裏切るとは思わなかった
    • I never thought he would play me false.
    • 彼女は夫を裏切った
    • She was unfaithful to her husband.
    • 彼は味方を裏切って殺された
    • He was killed for having double-crossed [sold out] his friends.
  1. 2〔期待に反する〕
    • 彼は失敗して彼女の期待を裏切った
    • His failure disappointed her.
    • 彼は世間の期待を裏切った
    • He failed to live up to the people's expectations./He let the people down.