Best, adv.; superl. of Well. 1. In the highest degree; beyond all others. “Thou serpent! That name best befits thee.” Milton.
He prayeth best, who loveth best
All things both great and small.
Coleridge.
2. To the most advantage; with the most success, case, profit, benefit, or propriety.
Had we best retire? I see a storm.
Milton.
Had I not best go to her?
Thackeray.
3. Most intimately; most thoroughly or correctly; as, what is expedient is best known to himself.