verb

• (transitive) To push or pump (something, especially fluids) into a cavity or passage.
• (transitive) To introduce (something) suddenly or violently.
• (transitive) To administer an injection to (someone or something), especially of medicine or drugs.
• (intransitive) To take or be administered something by means of injection, especially medicine or drugs.
• (transitive, computing) To introduce (code) into an existing program or its memory space, often without tight integration and sometimes through a security vulnerability.
• (obsolete, transitive) To cast or throw; used with on.
• (transitive) To introduce or add (something that is different or foreign).