I. noun Date: 1869 an unaccented beat or portion of a beat in a musical measure, an increase in activity or prosperity , II. adjective Date: 1947 cheerful , optimistic
UPBEAT
Meaning of UPBEAT in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012