Definition of catchweight:
(adj) :
(sports) Without any weight restrictions; having no handicap.
(adv) :
(horse racing) Without any weight restrictions; without being handicapped.
(n) :
(sports) A weight category other than the standard weight categories: either an agreed-upon weight range or an agreement to allow any weight.
(adj) :
Having no standard weight, but rather having weight determined when packaged for sale or shipping.
(n) :
The weight of an item that is not set to a standard, but which varies around an approximate value.
(n) :
The weight of all the fish caught.