Performed or participated in a duet; sang or played a musical piece for two voices or instruments.
Past tense of 'duet,' which comes from Italian 'duetto,' from Latin 'duo' (two). The verb form developed from the noun as music terminology became standardized in English.
Musicians would 'duet' and poets would write about lovers 'duetting,' making it a verb that's almost exclusively used in musical and romantic contexts—you don't usually hear 'they duetted on the sofa while doing taxes,' which is why it feels so elegantly specialized.
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