DEF: the opposite, less good, or less popular side of something.
EX: The flip side of the treatment is that it can make patients feel very tired.
Merriam-Webster Online Dictionary
flip side (noun)1.
the reverse and usually less popular side of a phonograph record
2.
a reverse or opposite side, aspect, or result - the flip side of deficient saving … is overconsumption R. S. Gay
