word choice - English Language & Usage Stack Exchange
https://english.stackexchange.com/questions/29619/why-is-ouster-the-act-of-ousting-and-not-one-who-ousts
WebSorted by: 5. An ouster (noun) is an ejection from an office or a position. Etymonline gives its derivation thus: oust early 15c., from Anglo-Fr. oster (late 13c.), O.Fr. oster "put out, keep off, remove, avert" (Fr. ôter ), from L. obstare "stand opposite to, block, hinder," from ob "against" + stare "to stand," from PIE base sta - "to stand ...
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