{i} negative side, unpleasant aspect, disadvantage; lower side; decrease, slump, fall (in stock prices, etc.)
A breakout which penetrates a support and indicates an impending fall in the market is referred to as a breakout "downside"
The downside of a situation is the aspect of it which is less positive, pleasant, or useful than its other aspects. The downside of this approach is a lack of clear leadership upside. the negative part or disadvantage of something