Meaning of “discharge” - Learner’s Dictionary

discharge

verb [ T ] uk us /dɪsˈtʃɑːdʒ/
PERSON

to allow someone to leave a hospital or prison, or to order or allow someone to leave an organization such as the army:

[ often passive ] She was discharged from the army yesterday.
SUBSTANCE

If a liquid or gas is discharged from something, it comes out of it:

There is evidence that radioactive waste was discharged from the factory.

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