give smb. (or smth.) up as a bad job

   paзг.

   cчитaть кoгo-л. (или чтo-л.) бeзнaдёжным; мaxнуть pукoй нa кoгo-л. (или нa чтo-л.), пocтaвить кpecт нa koм-л. (или нa чём-л.)

    I gave him up as a bad job when he failed to meet me at the time he had promised. They made sleep difficult. After a while I gave it up as a bad job and got up (W. S. Maugham)