名詞 duel:

1. a prearranged fight with deadly weapons by two people (accompanied by seconds) in order to settle a quarrel over a point of honor
   同義詞：affaire d'honneur
2. any struggle between two skillful opponents (individuals or groups)

動(dòng)詞 duel:

1. fight a duel, as over one's honor or a woman

1. A challenge to a duel.
   挑戰(zhàn)要求決斗
2. A duel or battle with firearms.
   槍戰(zhàn)用火器進(jìn)行的決斗或戰(zhàn)斗
3. They are engaging in a duel of words.
   他們雙方在斗嘴。
4. I challenge him to a duel.
   我向他挑戰(zhàn)進(jìn)行決斗。

du.el

n.（名詞）
A prearranged, formal combat between two persons, usually fought to settle a point of honor.
決斗：預(yù)先安排的兩人間正式格斗，一般是通過斗爭解決關(guān)系到榮譽(yù)的某件事，某一點(diǎn)
A struggle for domination between two contending persons, groups, or ideas.
斗爭：相互對(duì)抗的人們，團(tuán)體或思想之間爭奪統(tǒng)治地位的斗爭
v.（動(dòng)詞）
du.eled 或 du.elled du.el.ing 或 du.el.ling du.els 或 du.els
v.tr.（及物動(dòng)詞）
To engage (another) in or as if in formal combat.
使（另一人）參加或好象參加決斗
To oppose actively and forcefully.
反對(duì)：積極而有力地反對(duì)
v.intr.（不及物動(dòng)詞）
To engage in or as if in formal combat.
參加或好象參加正式?jīng)Q斗

來源：
Middle English duelle
中古英語 duelle
from Medieval Latin duellum
源自 中世紀(jì)拉丁語 duellum
from Latin [war]
源自 拉丁語 [戰(zhàn)爭]
variant of bellum
bellum的變體

【引伸】
du.eler 或
du.elist
n.（名詞）