discredit

vt.

1. 使丢脸；败坏……的名声
   She discredited his good name with ugly gossip.

   她散布恶毒的流言蜚语，败坏他的好名声。

2. 使不足信
   New information discredited the old report.

   新消息证实原来的报导不真实。

3. 不信，怀疑
   There was good reason to discredit the witness.

   有充分理由不相信那位证人。