du·o

[doo-oh, dyoo-oh]
noun, plural du·os.
1.
Music. duet.
2.
two persons commonly associated with each other; couple.
3.
two animals or objects of the same sort; two things ordinarily placed or found together; a pair: a duo of lovebirds.

Origin:
1580–90; < Italian < Latin: two

Dictionary.com Unabridged

duo-

a combining form meaning “two,” used in the formation of compound words: duologue.

Origin:
combining form of Greek dýo, Latin duo two

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Duo is always a great word to know.
So is flibbertigibbet. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
duo (ˈdjuːəʊ) [Click for IPA pronunciation guide]
 
n , pl duos, dui
1.  music
 a.  a pair of performers
 b.  another word for duet
2.  a pair of actors, entertainers, etc
3.  informal a pair of closely connected individuals
 
[C16: via Italian from Latin: two]

duo-
 
combining form
indicating two: duotone
 
[from Latin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

duo
1590 "song for two voices," via either It. or Fr. from L. duo "two."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Suddenly, no one had any idea what the dynamic duo had in mind.
Alas, it is not clear whether the duo will actually compete.
Pecorino's fame has garnered the duo some unusual privileges.
More complex codes could provide even more safety but the duo doesn't think
  this is necessary.
Slang
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