The downside is the negative part of a situation, the drawback or disadvantage that comes along with something. Every choice has an upside (the good part) and a downside (the not-so-good part). The downside of staying up late to finish a great book is feeling tired the next morning. The downside of getting a puppy is the responsibility of walking it every day, even when it's raining.

When people weigh their options, they consider both sides. Moving to a new city might mean better opportunities (the upside), but leaving friends behind (the downside). Getting the lead role in the school play is exciting (upside), but it requires giving up free time for rehearsals (downside).

The word often appears when someone is being realistic about a decision. A friend might say, “The downside of joining the soccer team is all the early morning practices.” Sometimes people ask, “What's the downside?” when they want to understand the full picture before making a choice. Recognizing the downside doesn't mean being negative. It means thinking clearly about tradeoffs so you can make smart decisions and prepare for challenges you might face.