(idiomatic) to purchase the entire stock or extent of something(verb)
To purchase the ownership of a company(verb)
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Use "buy out" in a sentence
"We have been informed here by a letter (purporting to be written by a Mr. Stover), that the Canada Company actually refuses to sell land to colored persons; and that they are anxious to buy out the colored settlers at Wilberforce."
"The old proverb was a yeoman of Kent wth one years rent Could buy out ye Gentlemen of Wales and knight of Sscales and a Lord of ye North Country – his Estate was so much better."
"At the grassroots level, for example, Paula Silver arranged with local Greek community groups for them to buy out complete shows of the movie on the first Friday of its opening, much like “first Friday” clubs for other urban movies."