Wiktionary
vb. (context intransitive English) To fight or compete against one or more opponents, in order to decide a winner.
Usage examples of "battle it out".
Pashta's ears flattened and it took all Rohan's skill to keep the two horses from turning to battle it out.
These would battle it out for third place, for it was obvious that the contest for first would be between Sorin and Masul.
But the central point is that these typical dualisms (such as coherence versus correspondence in epistemology) are dual partners forever fated to battle it out with each other .
He had no intention now of trying to battle it out with this fully fit man.
Having watched omnipotent immortals battle it out, just moments before, Hari knew there was very little that even Mors Planch or Biron Maserd could accomplish if they were let loose in the galaxy's future.
Pashta's ears flattened and it took aH Rohan's skill to keep the two horses from turning to battle it out.
How can we - he indicated himself and his bedraggled companion - how can we battle it out with an intergalactic strike force?
Prime Minister David Doron sat behind the large conference table and listened to his senior aides battle it out.