What is the meaning of tug?

noun

• A sudden abrupt pull.
  • synonyms: jerk
• A powerful small boat designed to pull or push larger ships.
  • synonyms: tugboat, towboat, tower

verb

• Pull hard.
  • usage: "The prisoner tugged at the chains"; "This movie tugs at the heart strings"
• Strive and make an effort to reach a goal.
  • usage: "She tugged for years to make a decent living"; "We have to push a little to make the deadline"; "She is driving away at her doctoral thesis"
  • synonyms: labor, labour, push, drive
• Tow (a vessel) with a tug.
  • usage: "The tugboat tugged the freighter into the harbor"
• Carry with difficulty.
  • usage: "You'll have to lug this suitcase"
  • synonyms: lug, tote
• Move by pulling hard.
  • usage: "The horse finally tugged the cart out of the mud"
• Pull or strain hard at.
  • usage: "Each oar was tugged by several men"
• Struggle in opposition.
  • usage: "She tugged and wrestled with her conflicts"