1.  duel(n = noun.act) affaire d'honneur - a prearranged fight with deadly weapons by two people (accompanied by seconds) in order to settle a quarrel over a point of honor;
is a kind of combat, fight, fighting, scrap
Derived forms verb duel₁, noun duelist₁, noun duellist₁

2.  duel(n = noun.act) - any struggle between two skillful opponents (individuals or groups);
is a kind of battle, struggle
Derived forms noun duelist₁, noun duellist₁

   duel(v = verb.competition) - fight a duel, as over one's honor or a woman; "In the 19th century, men often dueled over small matters"
is one way to contend, fight, struggle
Derived forms noun duel₁, noun dueler₁, noun duelist₁, noun dueller₁
Sample sentences: Somebody ----s; Somebody ----s somebody

duel, n. & v.
--n.
1 hist. a contest with deadly weapons between two people, in the presence of two seconds, to settle a point of honour.
2 any contest between two people, parties, causes, animals, etc. (a duel of wits).
--v.intr. (duelled, duelling; US dueled, dueling) fight a duel or duels.

Derivative:
dueller n. (US dueler). duellist n. (US duelist).

Etymology:
It. duello or L duellum (archaic form of bellum war), in med.L = single combat

N  contention, strife, contest, contestation, struggle, belligerency, opposition, controversy, polemics, debate, war of words, logomachy, litigation, paper war, high words, sparring, competition, rivalry, corrivalry, corrivalship, agonism, concours, match, race, horse racing, heat, steeple chase, handicap, regatta, field day, sham fight, Derby day, turf, sporting, bullfight, tauromachy, gymkhana, boat race, torpids, wrestling, greco-roman wrestling, pugilism, boxing, fisticuffs, the manly art of self-defense, spar, mill, set-to, round, bout, event, prize fighting, quarterstaff, single stick, gladiatorship, gymnastics, jiujitsu, jujutsu, kooshti, sumo, athletics, athletic sports, games of skill, shindy, fracas, clash of arms, tussle, scuffle, broil, fray, affray, affrayment, velitation, colluctation, luctation, brabble, brigue, scramble, melee, scrimmage, stramash, bushfighting, free fight, stand up fight, hand to hand, running fight, conflict, skirmish, rencounter, encounter, rencontre, collision, affair, brush, fight, battle, battle royal, combat, action, engagement, joust, tournament, tilt, tilting, tournay, list, pitched battle, death struggle, struggle for life or death, life or death struggle, Armageddon, hard knocks, sharp contest, tug of war, naval engagement, naumachia, sea fight, duel, duello, single combat, monomachy, satisfaction, passage d'armes, passage of arms, affair of honor, triangular duel, hostile meeting, digladiation, deeds of arms, feats of arms, appeal to arms, pugnacity, combativeness, bone of contention, contending, together by the ears, at loggerheads, at war, at issue, competitive, rival, belligerent, contentious, combative, bellicose, unpeaceful, warlike, quarrelsome, pugnacious, pugilistic, gladiatorial, palestric, palestrical, a verbis ad verbera, a word and a blow, a very pretty quarrel as it stands, commune periculum concordiam parit, lis litem generat.