fight one's corner

Verb

fight one's corner (third-person singular simple present fights one's corner, present participle fighting one's corner, simple past and past participle fought one's corner)

1. (UK, idiomatic) To vigorously promote or defend one's interests, views, etc.
   • The right hon. Gentleman the Member for Trinity College, who had fought his corner well for the landlords, must know the heavy disabilities under which the tenants referred to suffered through no fault of their own.1896, The Parliamentary Debates of the United Kingdom of Great Britain and Ireland, vol. XLIII, p. 866 (Google preview)
   • Mr Kornhauser could now have the British Government helping to fight his corner. Malcolm Rifkind, the Foreign Secretary, is to put pressure on the Swiss government.1996 September 10, Charlie Bain, Louise Jury, “Swiss asked: 'Where is that stolen gold?'”, in Independent, UK, retrieved 11 Aug 2017