Tug.
1. (Harness.) A trace by which the draft animal pulls the load. At the end of the trace is a tug-hook, or cock-eye; the former for a but-chain, the latter for attachment to the tug-pin on the end of the single-tree.
2. (Nautical.) A steam-vessel used for towing a sailing or disabled vessel, or a hull before receiving its rigging or steam equipment.
3. (Mining.) The iron hoop of a corve to which the tackle is attached.
4. (Vehicle.) A kind of timber carriage.