Che cosa significa Der ist ganz starr geworden vor Anspannung, gibt keinen Laut von sich. Selbst von dem laermenden Nachbarn hoert man nichts. Dreyman bringt es nicht uebers Herz. ?

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@a01099850864 you didn't give the whole context . Nicht übers Herz bringen means you don't have the guts to do something or you can't bare doing it like you can't kill somebody or you can't hurt somebody emotionally . whatever he is talking about he doesn't want to hurt someone or say something what hurts someone . The neighbors stuff doesn't make sense, do they have a party that they are so loud and they are so into their conversation that they hear nothing . well the first part indicates that he is nervous and when you get stief you can't really talk.
The heart represents emotions so whatever he does he is emotionally conflicted about it
Er kann es nicht übers Herz bringen him die wahrheit zu sagen. He can't stomach it to tell him the true because he knows the truth will hurt him . the part you picked does not explains his emotional problem with the situation . it only says that he got very tense and it became very quiet