(uncountable) The supreme effort one can make, or has made.
(uncountable) One's best behavior.
(countable) The person (or persons; or thing or things) that is (are) most excellent.
To surpass in skill or achievement.
(transitive) To beat in a contest.
(modal verb, colloquial) Had best.
superlative form of good: most good.
Most; largest.
Most superior; most favorable.
superlative form of well: most well
To the most advantage; with the most success, cause, profit, benefit, or propriety.