practice what you preach
成語所屬單字practice
practice what you preach — 慣用語
1. to do the things yourself that you tell other people they should do.
1.慣用語
釋義
言行一致；以身作則
to do the things yourself that you tell other people they should do.
例句
The mayor talks a lot about saving water, but he should practice what he preaches.
If parents want their children to read, they need to practice what they preach.