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had better (do something)
Should. You had better listen to what I'm saying before you get yourself into more trouble.
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.