dis-, 不，非，使相反。credit,信任，信誉。

1. He says his accusers are trying to discredit government foreign-aid policies.

他说他的责难者试图使政府的对外援助政策名声扫地。

2. He said such methods would discredit the party worldwide.

他说这一举措会让该政党在全世界名誉扫地。

3. They spread disinformation in order to discredit politicians.

他们散布假消息，企图败坏政治家的名声。

4. Agents provocateurs may seek to discredit the opposition.

密探可能会力求败坏反对派的名声。

5. The photos were deliberately taken to discredit the President.

这些蓄意拍摄的照片旨在败坏总统的名声。