take it to the cage

Be willing to go all the way with something. Refers to the mixed martial arts cage and the kind of hardcore punishment competitors are willing to face. Sometimes used to over-dramatize skirmishes.

Lisa was angry that Beth wanted to see Harry Potter instead of Sex and the City and was ready to take it to the cage.

Our manager said we had to switch to green Post-Its, but Bill took it to the cage and won. We still get to use the yellow ones.