A duo is a pair of things or people. Batman and Robin are a famous dynamic duo, but a duo is any two people doing something together, not just crime fighting. In fact, a duo usually entertains.

You can complain that you can't find a duo of matching socks, but it's more common to use duo for people who perform together. For example, Penn and Teller are a magician duo, and Laurel and Hardy were a comedy duo. If you and your sister play your ukuleles together in the subway for tips, you're also a duo. Originally, a duo was a song written for two voices, from the Latin meaning of duo, "two."

Definitions of duo
  1. noun
    two items of the same kind
    synonyms: brace, couple, couplet, distich, duad, duet, dyad, pair, span, twain, twosome, yoke
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    (bridge) a pair of playing cards that are the only cards in their suit in the hand dealt to a player
    type of:
    2, II, deuce, two
    the cardinal number that is the sum of one and one or a numeral representing this number
  2. noun
    a pair who associate with one another
    synonyms: couple, duet, twosome
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    same-sex marriage
    two people of the same sex who live together as a family
    type of:
    two people considered as a unit
  3. noun
    two performers or singers who perform together
    synonyms: duet, duette
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    Laurel and Hardy
    United States slapstick comedy duo who made many films together
    type of:
    musical group, musical organisation, musical organization
    an organization of musicians who perform together
  4. noun
    a musical composition for two performers
    synonyms: duet, duette
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    type of:
    composition, musical composition, opus, piece, piece of music
    a musical work that has been created
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