From Longman Dictionary of Contemporary Englishfight your cornerfight your cornerBritish English to try to persuade people that your ideas about something are right and should be accepted The prime minister made it clear that Britain would fight its corner on Europe. → fight
Examples from the Corpus
fight your corner• He had nobody back in Langley who would be willing to fight his corner.• Sara Keays has continued to fight her corner.• She always said he should have stayed to fight his corner.• Jen fought her corner fiercely but Helen knew that she was winning. 