fight (one's) corner

To argue in defense of something. You'll have to fight your corner if you want the boss to take your ideas seriously.

COMMON If you fight your corner, you argue strongly for what you want or believe in. The future of Britain lies in the EU, and we must fight our corner using honest and intelligent arguments. Note: Verbs such as argue, defend, and stand are sometimes used instead of fight. As usual, she passionately argued her corner. He at least had the courage to stand his corner. Note: In a boxing match, each boxer is given a corner of the ring. They return to their corner at the end of each round.