Definition of betters:
(adj) :
Greater or lesser (whichever is seen as more advantageous), in reference to value, distance, time, etc.
(adj) :
Greater in amount or quantity
(adj) :
Healed or recovered from an injury or illness.
(v) :
(intransitive) To become better; to improve.
(v) :
(transitive) To improve.
(v) :
(transitive) To surpass in excellence; to exceed; to excel.