add. ·noun a rough sled or dray used for dragging logs, hauling stone, ·etc.
2. go-devil ·add. ·noun a weight which is dropped into a bore, as of an oil well, to explode a cartridge previously lowered.
3. go-devil ·add. ·noun a device, as a loosely fitted plug, which is driven through a pipe by the pressure of the contents behind the plug to clear away obstructions.