Meaning of “inject” - Learner’s Dictionary

inject

verb [ T ] uk us /ɪnˈdʒekt/
DRUG

to put a drug into someone's body using a needle:

Phil's diabetic and has to inject himself with insulin every day.
IMPROVE

to add a good quality to something:

The new teacher has injected a bit of enthusiasm into the school.
MONEY

to provide a large amount of money for a plan, service, organization, etc:

The government plans to inject £100 million into schools.

(Definition of “inject” from the Cambridge Learner’s Dictionary © Cambridge University Press)