I. noun Etymology: 2up + 1side Date: 1927 an upward trend (as of prices), 2. a positive aspect, promise , potential , II. preposition Etymology: perhaps from 1up + -side (as in alongside) Date: 1929 up on or against the side of
UPSIDE
Meaning of UPSIDE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012