Definition of “expel” - Learner’s Dictionary

expel

verb [ T ] us uk /ɪkˈspel/ present participle expelling, past tense and past participle expelled
MAKE SOMEONE LEAVE

to make someone leave a school, organization, or country because of their behaviour:

[ often passive ] He was expelled from school for hitting another student.
FORCE SOMETHING OUT formal

to force air, gas, or liquid out of something:

Slowly expel all the air from your lungs.

(Definition of “expel” from the Cambridge Learner's Dictionary © Cambridge University Press)