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against·er | \ əˈgen(t)-stər 
, -ˈgin(t)-, -ˈgān(t)- \
, -ˈgin(t)-, -ˈgān(t)- \ plural againsters
Definition of againster
informal
: a person who frequently or habitually expresses opposition to the ideas or policies of others
Gerry Ford has always been an “againster.” That was the duty of the Republican leadership in the House—never to propose, always to oppose.— Thomas P. “Tip” O'Neill, quoted in The (Dubuque, Iowa) Telegraph Herald, 11 Jan. 1976
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Time Traveler for againster
The first known use of againster was in 1919
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