Longman Dictionary of Contemporary English homepage

best

2 adverb
     
best2 S1 W2 [superlative of well]
1 in a way that is better than any other:
It works best if you let it warm up first.
This can best be described as a series of steps.
the best-dressed man in Paris
2 to the greatest degree [= most]:
You know him best - you should ask him.
The part I like best is the meal afterwards.
He's perhaps best known for his role in 'Midnight Cowboy.'
3

as best you can

spoken as well as you can, even if this is not very good:
I'll try and fix it as best I can.
4

had best

spoken ought to:
We'd best be getting back.

➔ had better

at better2 (3)

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