duke it out
US /duːk ɪt aʊt/
UK /duːk ɪt aʊt/

1.
enfrentarse, pelear
to fight or compete to resolve a dispute or determine a winner
:
•
The two rivals decided to duke it out in the final round.
Los dos rivales decidieron enfrentarse en la ronda final.
•
Let's just duke it out and see who's right.
Vamos a pelear y ver quién tiene razón.