had better (do something)
Should. You had better listen to what I'm saying before you get yourself into more trouble.
had better
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 do something
used to tell somebody what you think they should do: You’d better lock the door before you leave: there are lots of thieves about.Hadn’t you better check to see if the baby is all right?‘Shall I phone her now?’ ‘You’d best not. She might be asleep.’ 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.