U

duet

noun

a musical composition for two voices or instruments.

noun

Also called (esp for instrumental compositions): duo a musical composition for two performers or voices
an action or activity performed by a pair of closely connected individuals

verb duets, duetting or duetted

(intr) to perform a duet

1740, from French duet, from Italian duetto “short musical composition for two voices,” diminutive of duo “two” (see two). As a verb, from 1822. The Italian form of the noun was used in English from c.1724.