undermine somebody's confidence

They also try to undermine confidence in the entire process.

"If you really want to undermine confidence, that would do it."

He wasn't going to say anything that might undermine Dennis's confidence, though.

More important, it undermines our confidence in the news that we are getting.

If time began to undermine her confidence in such an outcome, it would be different.

It's not only the critical things said directly to your children that can undermine confidence.

A failure to do this will undermine confidence in Europe.

Don't settle for less - it will only undermine your confidence further.

During the training, some of them did things to undermine my confidence.

He could see that she wanted to turn away; but his anger undermined her confidence.