/ aʊst; NAmE / verb
[ vn ] oust sb (from sth / as sth) to force sb out of a job or position of power, especially in order to take their place :
He was ousted as chairman.
The rebels finally managed to oust the government from power.
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WORD ORIGIN
late Middle English (as a legal term): from Anglo-Norman French ouster take away, from Latin obstare oppose, hinder.