1 [I,T] to give a talk (a sermon) on a religious subject, especially in a church 讲道；布道；传教

2 [T] to say that sth is good and persuade other people to accept it 鼓吹；倡导；宣扬: I always preach caution in situations like this. 在这种情况下我总是主张小心谨慎。

3 [I] to give sb advice on how to behave, on what is considered morally acceptable, etc, in a way that he/she finds boring or annoying （令人厌烦或生气地）说教，训诫: I'm sorry, I didn't mean to preach. 对不起，我不是有意向你说教。