Wiktionary
fight to the death
vb. To take part in a battle in which the winner is the sole survivor.
Usage examples of "fight to the death".
Instead, he and the young female witch beside him were about to embark on a fight to the death.
As long as he clung to that pole, the whole Imperial Army was going to fight to the death to defend him.
If it had been a fight to the death, that would have been one thing.
But fewer Gradi manned the keep than had been here before, and not all of them chose to fight to the death.
And for all their determination to fight to the death, Achuultani didn’.