Definition of besting:
(adj) :
Most superior; most favorable.
(adj) :
Most; largest.
(adv) :
To the most advantage; with the most success, cause, profit, benefit, or propriety.
(n) :
(countable, often used after definite article) The person (or persons; or thing or things) that is (are) most excellent.
(n) :
(uncountable, often used after possessive determiners) The supreme effort one can make, or has made.
(n) :
(uncountable, often used after possessive determiners) One's best behavior.