Dreaming of a duel typically symbolizes a conflict or competition in your life. It indicates that you are facing a struggle or disagreement with someone. If you are fighting with weapons, it may reflect the depth of your relationship, where your partner's character aligns with your own. Such dreams encourage you to review the aspects of your relationships and make the right decisions.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Duel" (page 131).
In a dream, a duel signifies strength or a dispute with someone or disruption, dispersion or a fight. A duel with weapons in a dream means marriage to someone whose character is similar in interpretations to the weapon one is carrying in his dream. Wearing armature during a duel in a dream means marriage to a rich but deceiving person, for part of the human body is covered during the combat. A duel with swords in a dream means honor. Waving a sword during a duel in a dream means becoming known in one's field. (Also see Marriage; Sword)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.