As a Noun: 1. A small tube with a plunger and a fine hollow needle or pointed end. It is used for putting liquids into something and taking them out, for example drugs into a person's body or for taking blood samples from them. English = syringe, hypodermic needle. 2. The act of using a syringe to put liquids into a person's body. English = injection. Informal English = jab. 3. The act of injecting someone with a weak form of a disease as a way of protecting them from it. English = immunisation, inoculation, vaccination. 4. A person who injects themselves with harmful drugs; the drugs themselves. English = drug addict, intravenous drug user; drugs, heroin. As a Verb or Adjective: 1. To use a syringe to put liquid into a person's body. English = inject. Informal English = jab. 2. To inject someone with a weak form of a disease as a way of protecting them from it. English = immunise, inoculate, vaccinate. 3. To inject yourself with harmful drugs, often because you are addicted to them. Informal English = shoot up. 4. [Especially at 'unusual' locations on the body (e.g., teeth, jaw, various joints)], to administer a local anaesthetic by injection.