lay down the law   (TTS發音)

1. give strict orders下命令；嚴令

    He could usually be found in the centre of a small group of people to whom he was laying down the law. 我們常看到他在一小群人當中發號施令。

2. speak severely or seriously about a wrong doing；scold嚴厲斥責；呵斥

    The principal called in the students and laid down the law to them about skipping classes. 校長集合學生嚴責他們逃課。

    Father is laying down the law to the children again； I wonder what they've done now. 父親又嚴厲地訓斥孩子們了，不知道他們現在又幹了什麼事。