Noun
(US, colloquial) A gadget or unspecified device, as used in various industries.
A weight which is dropped into a bore, as of an oil well, to explode a cartridge previously lowered.
A device, such as a loosely fitted plug, which is driven through a pipe by the pressure of the contents behind the plug to clear away obstructions.
A rough sled or dray used for dragging logs, hauling stone, etc.
Source: en.wiktionary.org