Definition of had best do something in English:

had best do something

Find it most sensible or well advised to do the thing mentioned: I’d best be going
More example sentences
  • Anyone who wants to raise this as a problem had best do it behind his back, because if he's around to respond, he will respond brilliantly.
  • My impression is that they realize that there's a crisis here, and they had best do something about it.
  • Having become totally addicted to waterfall hiking we realized we had best do it safely and respectfully.
See parent entry: best

Definition of had best do something in:

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Word of the day flagitious
Pronunciation: fləˈjiSHəs
adjective
(of a person or their actions) criminal; villainous