To introduce (something) suddenly or violently.
To introduce (code) into an existing program or its memory space, often without tight integration and sometimes through a security vulnerability.
To take or be administered something by means of injection, especially medicine or drugs.
To administer an injection to (someone or something), especially of medicine or drugs.
To push or pump (something, especially fluids) into a cavity or passage.
To introduce or add (something that is different or foreign).
Used other than figuratively or idiomatically: see work, in.
To find time or space for, amid other things.
To work out using a machine in between the sets of someone who is already using that machine.