noun

• (boxing) A short straight punch.
  "American Ward was too quick and too slick for his British rival, landing at will with razor sharp jabs and hooks and even bullying Froch at times."
• (British) A medical hypodermic injection (vaccination or inoculation)
  "Our dog was exposed to rabies, so the whole family went to a clinic to get our jabs."
• (British, Australia, New Zealand, sometimes Philippines) A vaccination, whether or not delivered via conventional injection.
  "A 'painless' sticking plaster flu jab that delivers vaccine into the skin has passed important safety tests in the first trial in people."
• (US, figurative) A mild verbal insult.

verb

• (slang, UK) To give someone an injection.
• (slang) To vaccinate or inoculate someone.