duke it out

US /duːk ɪt aʊt/
UK /duːk ɪt aʊt/
"duke it out" picture
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.