againstern.
/əˈɡɛnstə/, /əˈɡeɪnstə/, U.S. /əˈɡɛnstər/ colloquial (chiefly U.S.)
A person who is against something, esp. a proposed change. Also: a person who habitually opposes things; one who has a generally oppositional or critical attitude. Cf. aginer n.
ΘΚΠ
the world > action or operation > difficulty > opposition > [noun] > opponent > one opposed to some person or thing
opponent1658
virtuoso-mastix1671
anti1814
warrer1836
against1843
reactionist1902
aginer1905
againster1919
nay-sayer1925
1919 Country Gentleman 2 Aug. 13/2 Though I'm a hard-shell conservative, yet I suppose I'm always a little more interested in the ‘try-to-doers’ than in the ‘againsters’.
1945 Daily Times (Chicago) 25 Aug. 11/1 The againsters have dragged out the old slogan: The full employment bill would bring about a government-managed national economy.
1988 Horoscope's Star Guide Jan.–June 1989 42/1 Too much of the nonconformist reaction can make a person a contentious ‘againster’ who, no matter what the subject, will argue against the prevailing attitudes.
2009 D. Silverman Twinkle xix. 127 ‘Is there anything you like that you're supposed to like? You're an “againster” aren't you?’.. ‘What's an againster?’.. ‘An oppositer, a..contrary Mary.’
This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021).
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n.1919