WordReference Random House Learner's Dictionary of American English © 2015
up•beat /ˈʌpˌbit/USA pronunciation n. [countable]
  1. Music and Dancean unaccented beat in music.
  2. Music and Dancethe upward stroke with which a conductor indicates such a beat.

  • optimistic;
    cheerful:an upbeat report on the economy.

  • Collins Concise English Dictionary © HarperCollins Publishers::

    upbeat /ˈʌpˌbiːt/ n
    1. a usually unaccented beat, esp the last in a bar
    2. the upward gesture of a conductor's baton indicating this
    1. informal marked by cheerfulness or optimism

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