Definition of welters:
(n) :
A general confusion or muddle, especially of a large number of items.
(n) :
A tossing or rolling about.
(v) :
(intransitive) To roll around; to wallow.
(v) :
(intransitive, of waves, billows) To rise and fall, to tumble over, to roll.
(v) :
(intransitive, figurative) To revel, luxuriate.
(adj) :
Heavyweight. (of horsemen)