To inject is to force a liquid, usually medicine, into something, often using a needle and syringe. It can also mean to add something new, like energy or ideas, into a situation.
It comes from Latin “inicere,” meaning “to throw in” or “to put into,” from “in-” (into) and “iacere” (to throw). The idea shifted from throwing in to pushing liquid into the body.
Inject literally means “throw into,” which fits both needles and new ideas. Doctors inject medicine into veins; coaches inject energy into a tired team. The word always suggests adding something powerful directly into the system.
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