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should or must I thought I had better destroy the list so that no one else would see it. You'd better get moving if you want to catch your train.
Usage notes: had is sometimes not said: If we have a problem you better hope somebody is there to help you.
Also, had best. Ought to, should. For example, You had better finish this one before starting another, or We had best be going. [Mid-1400s] Also see you'd better believe it.
had better/best Usage Problem
To be wise or obliged to; should or must: He had better do what he is told. You had best bring a raincoat in this weather.