inject

To inject means to put or force something into something else, often in a direct and intentional way. Many people first meet this word in medicine, where a doctor or nurse injects a vaccine, drug, or other liquid into the body with a needle. That is the most literal use, but the word is also common in many other situations.

You can inject enthusiasm into a project, meaning you bring fresh energy to it. A cook might inject marinade into meat so the flavor goes inside. In a figurative sense, a comment can inject doubt into your mind, or a speaker can inject humor into a tense discussion. In business or economics, a company or government might inject money into a market, bank, or project to support it or help it grow.

The central idea is that something is being put in, not just placed nearby or added on top. Often there is a sense of purpose, force, or strong effect. If you inject cream into a doughnut, it goes inside. If you inject life into a dull event, you make it more lively. If harmful code is injected into software, something unwanted has been inserted into the system.

So, whether the context is medicine, food, conversation, finance, or software, inject describes the act of putting something into something else in a way that is meant to have an effect.