Definition of againster in English:

againster

noun

US
informal
  • A person who is against something, especially a proposed change. Also: a person who habitually opposes things; one who has a generally oppositional or critical attitude.

Origin

Early 20th century; earliest use found in Country Gentleman. From against + -er.

Pronunciation:

againster

/əˈɡɛnstə//əˈɡeɪnstə/