Definition of Brexiteer in English:

Brexiteer

Pronunciation /ˌbreksəˈtir/ /ˌbrɛksəˈtɪr/

noun

informal British
  • A person who is in favor of the United Kingdom withdrawing from the European Union.

    • ‘many Brexiteers laud Norway for its separateness from the EU’

Origin

Early 21st century from Brexit + -eer.