What is the meaning of swig?

noun

• A large and hurried swallow.
  • usage: "he finished it at a single gulp"
  • synonyms: gulp, draft, draught

verb

• Strike heavily, especially with the fist or a bat.
  • usage: "He slugged me so hard that I passed out"
  • synonyms: slug, slog
• To swallow hurriedly or greedily or in one draught.
  • usage: "The men gulped down their beers"
  • synonyms: gulp, quaff