1. measure or compare something
I want to see how I stack up against the competition
If you ask how something 'stacks up against' something else, you are asking 'how does it compare?' or 'how does it measure up?' This expression is frequently used to ascertain quality and competency and is therefore commonly heard in a professional environment. In a social context, it is more likely to be used in a competitive context, such as in relation to sport.