up beat

upbeat

[uhp-beet]
noun Music.
1.
an unaccented beat, especially immediately preceding a downbeat.
2.
the upward stroke with which a conductor indicates such a beat.
adjective
3.
optimistic; happy; cheerful: television dramas with predictably upbeat endings.

Origin:
1865–70; 1950–55 for def 3; up- + beat

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World English Dictionary
upbeat (ˈʌpˌbiːt)
 
n
1.  music
 a.  a usually unaccented beat, esp the last in a bar
 b.  Compare downbeat the upward gesture of a conductor's baton indicating this
2.  an upward trend (in prosperity, etc)
 
adj
3.  informal marked by cheerfulness or optimism

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

upbeat
"with a positive mood," 1947, apparently from the musical noun upbeat (1869), referring to the beat of a bar at which the conductor's baton is in a raised position; the "optimistic" sense apparently for no other reason than that it sounds like a happy word (the musical upbeat is no more inherently "positive"
than any other beat).
Online Etymology Dictionary, © 2010 Douglas Harper
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