duello
noun
du·el·lo d(y)ü-ˈe-(ˌ)lō 
plural duellos
1
: the rules or practice of dueling
2
: duel
Word History
Etymology
Italian, from Medieval Latin duellum
First Known Use
1588, in the meaning defined at sense 1
- keep it on the q.t.
- keep it short and sweet
- keep it simple
- keep kosher
- keep mum
- keep off
- keep on
- keep on at
- keep on her boss's good side
- keep on her toes
- keep on his toes
- keep one jump ahead
- keep one out of action
- keep one's cards close to one's chest/vest
- keep one's cards close to the chest/vest
- keep one's chin up
- keep one's composure
- keep one's cool
- keep one's cool/composure
- keep one's distance
- keep one's eye on the ball
- keep one's eye out for
- keep one's eyes glued to
- keep one's eyes open
- keep one's eyes open (for)