背せ負おい投なげを食くう

expression, godan verb (-u)

be betrayed unexpectedly; be stabbed in the back; be double-crossed

Idiomatic expression originating from judo, where 背負い投げ is a shoulder throw; metaphorically means being thrown by someone you trusted.

• 親しん友ゆうだと思おもっていた彼かれに背せ負おい投なげを食くわされた。

  I was betrayed by him, whom I thought was a close friend.

• まさかあの取とり引ひき先さきに背せ負おい投なげを食くうとは思おもわなかった。

  I never expected to be double-crossed by that business partner.