verb

• (transitive) To pull or drag with great effort.
  "The police officers tugged the drunkard out of the pub."
• (transitive) To pull hard repeatedly.
  "He lost his patience trying to undo his shoe-lace, but tugging it made the knot even tighter."
• (transitive) To tow by tugboat.
• (slang, ambitransitive) To masturbate.

noun

• (nautical) A tugboat.
  "Shipping of every sort, from passenger liners to ferry steamers, tramps to tugs and trailing barges, feluccas to speedboats and yachts, from warships to caiques, chugs, hoots, glides or churns its way in all directions."
• (obsolete) A kind of vehicle used for conveying timber and heavy articles.
  "Cattiwi came down the steep lane with his five-horse timber-tug"
• (mining) An iron hook of a hoisting tub, to which a tackle is affixed.
• (slang) An act of male masturbation.
  "He had a quick tug to calm himself down before his date."

noun

• (UK, slang) A foundationer or colleger at Eton.