Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Anglo-French
Origin: ouster, from Latin obstare 'to stand against, prevent'

oust

 verb
     
oust [transitive]
to force someone out of a position of power, especially so that you can take their place
oust somebody from something
The Communists were finally ousted from power.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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