Meaning

noun two items of the same kind

noun two performers or singers who perform together

noun a pair who associate with one another

originPIE word *dwóh₁ From French duo or Italian duo, from Latin duo (“two”), from Proto-Italic *duō, from Proto-Indo-European *dwóh₁. Doublet of two, which was inherited via Proto-Germanic.

Etymology from Wiktionary, CC BY-SA 3.0