Why is “ouster” the act of ousting and not one who ousts?

The question should be clear enough from the title.

Also: What are we supposed to call one who ousts? [If this warrants another question, I will edit this out and open another question.]

Answer

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” (see stet).

So the noun derives from the Anglo-French meaning, first and foremost in the sense of a “putting out” of someone, and it has come down to us as a handy synonym of “expulsion” or “impeachment” with the more general sense of relieving officials of their positions.

That said, ouster could be used in both senses: As someone who ousts someone else from a position, and the act of ousting that person. But the use in the former sense would be uncommon and not readily understood with no supporting context.

Attribution
Source : Link , Question Author : John Y , Answer Author : Robusto

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