sling-ding noun in fishing, a weight attached to a line of trawl to be set, to moor the end CANADA
These “sling-dings,” so-called, were made fast to the first end, and when the whole tub of 2100 feet of line was payed out into the water, an anchor would be used in the last or tub end. — Frederick Wallace, RovingFisherman, p. 68, 1955