Each of a pair of bullocks at the rear of a team pulling a large vehicle.
 I quietly got a stick and kept the pin bullocks up to their job
 Example sentencesExamples
-  From pin-bullocks to leaders, every beast was wearied out.
 -  The polers were attached closest to the waggon, with the pin bullocks next.
 -  He took the pin bullocks and the polers and left the rest to the owner.
 -  He stepped in to dig the near-side pin-bullock with the handle of the whip.
 -  Each bullock had a special position in the team — leaders, polers, pin bullocks, and so on.