best
{{en-superlative of|good}}.
Most; largest.
Most superior; most favorable.
(POS=adverb)
To the most advantage; with the most success, cause, profit, benefit, or propriety.
The supreme effort one can make, or has made.
One's best behavior.
The person (or persons; or thing or things) that is (are) most excellent.
To surpass in skill or achievement.
To beat in a contest.
(colloquial) Had best.