somebody had better/best do somethingused to say that someone should do something 某人最好[应该]做某事 You’d better phone to say you’ll be late. 你最好打电话去说一声你要晚到。
We’d better not tell Jim about our plans just yet. 我们最好先别把计划告诉吉姆。
→ somebody had better/best do something at have1(1)