From Longman Dictionary of Contemporary Englishoustoust /aʊst/ verb [transitive] GET RID OFto force someone out of a position of power, especially so that you can take their place SYN removeoust somebody from something The Communists were finally ousted from power.→ See Verb table
Examples from the Corpus
oust• Reformers have expressed concern that he could be ousted by hard-liners opposed to his reforms.• Her getting sacked was the biggest sensation since Rudolf Bing ousted Callas in 1958.• As Jane comes into her own, Owens is ousted from his own private Eden.• What has been happening since Suharto was ousted from power in 1998?• Nusabe was ousted in a coup late last year.• He hosted the meetings where the rebellion was fomented which ousted Mrs Thatcher from power.• Dole appeared to be drawing a lesson from the last four presidential candidates who ousted the opposition party from the White House.oust somebody from something• Hale was ousted from the company's main board in a big management shake-up.From Longman Business Dictionaryoustoust /aʊst/ verb [transitive] journalism1to force someone to leave a job or important positionProfit margins collapsed and Martinez was ousted as chairman.oust somebody from somethingtwo top executives who had been ousted from the board2if one company or product ousts another from its market position, it becomes more successfuloust something from somethingCotton eventually ousted wool from its dominant role in clothing production.→ See Verb tableOrigin oust (1400-1500) Anglo-French ouster, from Latin obstare “to stand against, prevent” 