A machine or tool of the nature of a grub axe, grub hook, etc.
(rugby) (also grubber kick), an attacking short distance kick in behind the defence in which the ball is bounced along the ground, using the uneven bounce of the ball to make it difficult for the defence to retrieve.
“Hurrying, sometimes leaping from boulder to boulder but never once glancing back or stopping to rest its heavy satchel, the grubling led them further down the gorge.”