ouster

Etymology 1

From Old French ouster, oustre, a nominalization of Anglo-Norman oustre (“to oust”).

noun

1. (historical) A putting out of possession; dispossession; ejection.
2. (property law) Action by a cotenant that prevents another cotenant from enjoying the use of jointly owned property.
3. (now chiefly US) Specifically, the forceful removal of a politician or regime from power; coup.
   Mr. Sunak, a former chancellor whose resignation in July precipitated Mr. Johnson’s ouster, earlier said he would not serve in Ms. Truss’s cabinet. 2022-09-06, Mark Landler, Stephen Castle, “Truss Takes Office, Promising Britons They Can ‘Ride Out the Storm’”, in The New York Times, →ISSN

verb

1. To oust.

Etymology 2

oust + -er

noun

1. (UK) Someone who ousts.