noun
: a device used in mining for sinking shafts in soft ground by boring to the full size with a very large tool resembling an auger behind the cutters of which large sacks are attached to catch material as it is removed
noun
: a device used in mining for sinking shafts in soft ground by boring to the full size with a very large tool resembling an auger behind the cutters of which large sacks are attached to catch material as it is removed
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012