n. a weight, as a rock, a piece of iron or lead, or a sock or mitten full of stones, attached to the first end of a trawl to be set, its function being to moor the end of the line.
1955  These "sling-dings," so-called, were made fast to the first end, and when the whole tub of 2,100 feet of line was payed out into the water, an anchor would be used on the last or tub end.