Meaning of “duel” - Learner’s Dictionary

duel

noun [ C ] uk us /ˈdjuːəl/
FIGHT

a type of fight in the past between two people with weapons, used as a way of deciding an argument:

He challenged him to a duel.
ARGUMENT/COMPETITION

an argument or competition between two people or groups

(Definition of “duel” from the Cambridge Learner’s Dictionary © Cambridge University Press)