From Longman Dictionary of Contemporary Englishbuy somebody ↔ off phrasal verbPAY FORto pay someone money to stop them causing trouble or threatening you SYN bribe → buy→ See Verb table
Examples from the Corpus
buy off• How much to buy them off?• Then, as the congregation grew, she bought land off Edge Hill and had a fine new church built in 1887.• So who, I wondered, would buy an off - roader that can't.• Whether you're buying online or off, the Net is an invaluable mine of consumer advice.• What I hear you saying is that I have lived my life as if I bought my clothes off the rack.• You can't buy it off the shelf, and it is difficult to grow.• I got fifteen bullets I bought right off the street from some school kid.From Longman Business Dictionarybuy somebody → off phrasal verb [transitive] to pay someone money or give them something they want to stop them causing trouble or doing something that harms youCompanies bought off the threat of trouble with high wage settlements. → buy→ See Verb table 