the upper side or part.

that part of a chart or graph that shows a higher level, esp. in price.

an upward trend, as in stock prices.

a positive result.

an encouraging or positive aspect.

going higher, esp. in price or worth

This stock has a nice upside potential.

on or against the side of

Give him a smack upside the head.

get upsides with

British . to get even with.