Meaning of “buy sb/sth out” - Learner’s Dictionary

buy sb/sth out

phrasal verb with buy us uk /baɪ/ verb [ T ] past tense and past participle bought

to buy part of a company or building from someone else so that you own all of it:

He bought out his partner for £3 million.

(Definition of “buy sb/sth out” from the Cambridge Learner’s Dictionary © Cambridge University Press)