From French duo or Italian duo, from Latin duo (“two”), from Proto-Indo-European *dwóh₁.
Cognate to two from Proto-Indo-European.
duo (plural duos)
- Two people who work or collaborate together as partners; especially, those who perform music together.
- Any pair of two people.
- Any cocktail consisting of a spirit and a liqueur.
- A song in two parts; a duet.