Definition
To behave in a way that aligns with the advice or beliefs one advocates to others; to follow one's own advice.
言行一致
The teacher always tells students to be on time, but he is often late himself. This is not practicing what you preach.
老師總是告訴學生要準時，但他自己卻經常遲到。這不是以身作則。
If you keep telling others to save money while spending lavishly yourself, then you are not practicing what you preach.
如果你一直告訴別人要省錢，自己卻大手大腳地花錢，那麼你並沒有以身作則。
As a leader, you must practice what you preach, or nobody will listen to you.
作為領導者，你必須以身作則，否則沒有人會聽你的。