n.1. An instance of tugging; a strong or sudden pull: gave the leash a tug.
2. A pulling force: the tug of gravity.
3. A contest; a struggle: a tug between loyalty and desire.
4. a. A tugboat.
b. A land, air, or space vehicle that moves or tows other vehicles: an airplane tug.
5. A rope, chain, or strap used in hauling, especially a harness trace.